dependences and hazards
play

Dependences and Hazards Lecture 17 CS301 Administrative Daily - PowerPoint PPT Presentation

Mar 03, 2024 •169 likes •1.41k views

Dependences and Hazards Lecture 17 CS301 Administrative Daily Review of todays lecture w Due tomorrow (10/30) at 8am HW #7 due today at 5pm HW #8 assigned w Due 10/5 at 5pm Read Chapter 4.8-4.9 Data Dependencies We

  1. Control Hazard In what cycle does the nextPC get calculated for the bne? End of 4 In what cycle does the or get fetched? Beginning of 3 IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID MEM WB or $s3, $s0, $t3 IF IF IF ID MEM WB end: sw $s2, 0($t1) 1 2 3 4 5 6 7 8 Time->

  2. Barriers to Pipeline Performance • Uneven stages • Pipeline register delays • Data Hazards • Control Hazards w Whether an instruction will execute depends on the outcome of a conditional branch still in the pipeline

  3. Control Hazard In what cycle does the nextPC get calculated for the bne? End of 4 In what cycle does the or get fetched? Beginning of 3 IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID MEM WB or $s3, $s0, $t3 IF IF IF ID MEM WB end: sw $s2, 0($t1) 1 2 3 4 5 6 7 8 Time->

  4. Solution 1: Add hardware to determine branch in decode stage In what cycle does the nextPC get calculated for the bne? End of 4 In what cycle does the or get fetched? Beginning of 3 IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID MEM WB or $s3, $s0, $t3 IF IF IF ID MEM WB end: sw $s2, 0($t1) 1 2 3 4 5 6 7 8 Time->

  5. Pipelined Machine Decode Execute Memory Fetch << << 4 2 2 Addr Out Data src1 src1data op/fun PC Read Addr Out Data rs Data Memory src2 src2data Instruction rt Register File Memory rd destreg imm In Data destdata Sign 16 32 Ext (Writeback) Pipeline Register

  6. Solution 1: Add hardware to determine branch in decode stage In what cycle does the nextPC get calculated for the bne? 3 In what cycle does the or get fetched? 3 IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF IF ID MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  7. Note • For the rest of this course, the branches will be determined in the decode stage • All other optimizations will be in addition to moving branch calculation to decode stage

  8. Solution 2: 
 Branch Delay Slot Redefine the semantics of a branch: ALWAYS execute the instruction after the branch, regardless of the outcome of the branch. IF ID MEM WB add $s5, $s4, $t1 bne $s0, $s1, end IF ID MEM WB nop IF ID EX MEM WB IF ID MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  9. Solution 2: Also add 
 Branch Delay Slot ALWAYS execute the instruction after the branch, regardless of the outcome of the branch. Try to fill that spot with an instruction from before the branch. bne $s0, $s1, end IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB IF ID MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  10. Branch Delay Slot • The hardware always executes instruction after a branch • The compiler tries to take an instruction from before branch and move it after branch • If it can find no instruction, it inserts a nop after the branch • If it forgets to place nop or inst there, you can get incorrect execution!!!!!

  11. Branch Delay Slot - Limitations • If you have a machine with 20 pipeline stages, and it takes 10 stages to calculate branch, how many branch delay slots are there? • Can you move any instruction into branch delay slot? • What happens as the pipeline gets deeper?

  12. Branch Delay Slot - Limitations • If you have a machine with 20 pipeline stages, and it takes 10 stages to calculate branch, how many branch delay slots are there? 9 • Can you move any instruction into branch delay slot? • What happens as the pipeline gets deeper?

  13. Branch Delay Slot - Limitations • If you have a machine with 20 pipeline stages, and it takes 10 stages to calculate branch, how many branch delay slots are there? 9 • Can you move any instruction into branch delay slot? Only independent instructions • What happens as the pipeline gets deeper?

  14. Branch Delay Slot - Limitations • If you have a machine with 20 pipeline stages, and it takes 10 stages to calculate branch, how many branch delay slots are there? 9 • Can you move any instruction into branch delay slot? Only independent instructions • What happens as the pipeline gets deeper? More difficult to fill slots • Branch delay slot is only used in short pipelines!

  15. Solution 3: Branch Prediction Guess which way the branch will go before calculation occurs. Clean up if predictor is wrong. IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF IF ID MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  16. Solution 3: Branch Prediction First: Always predict not taken If we are right, how many cycles do we stall? IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  17. Solution 3: Branch Prediction First: Always predict not taken If we are right, how many cycles do we stall? 0 IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  18. Solution 3: Branch Prediction First: Always predict not taken If we are wrong, then flush incorrect instruction(s) IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID EX MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  19. Solution 3: Branch Prediction First: Always predict not taken If we are wrong, then flush incorrect instruction(s) How many cycles do we stall? IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID EX MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  20. Solution 3: Branch Prediction First: Always predict not taken If we are wrong, then flush incorrect instruction(s) How many cycles do we stall? 1 IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID EX MEM WB or $s3, $s0, $t3 end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  21. Solution 3: Branch Prediction First: Always predict taken Why will this still result in a stall? IF ID MEM WB add $s5, $s4, $t1 IF ID MEM WB bne $s0, $s1, end IF ID EX MEM WB end: sw $s2, 0($t1) IF ID MEM WB 1 2 3 4 5 6 7 8 Time->

  22. Branch Prediction • If we’re going to predict taken, we need to know where to branch to earlier than when we determine where the branch actually goes to. w How?

  23. Branch Prediction • Understand the nature of programs • Are branch directions random? • If not, what will correlate? w Past behavior? w Previous branches’ behavior?

  24. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Is beq often taken or not taken? Is bne often taken or not taken?

  25. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Is beq often taken or not taken? Not Taken Is bne often taken or not taken?

  26. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Is beq often taken or not taken? Is beq often taken or not taken? Not Taken Is bne often taken or not taken? Is bne often taken or not taken? Taken Conclusion: We want a prediction that is unique to each branch. Look up prediction by PC

  27. First Branch Predictor Predict whatever happened last time Update the predictor for next time Predict Taken Predict Not Taken

  28. First Branch Predictor Predict whatever happened last time Update the predictor for next time T NT Predict Taken Predict Not Taken

  29. First Branch Predictor Predict whatever happened last time Update the predictor for next time T NT NT 1 0 T Predict Taken Predict Not Taken

  30. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 0 Prediction Reality NextState

  31. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 0 1 Prediction NT Reality T NextState 1

  32. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 0 1 1 Prediction NT T Reality T T NextState 1 1

  33. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 0 1 1 0 Prediction NT T T Reality T T NT NextState 1 1 0

  34. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 0 1 1 0 1 Prediction NT T T NT Reality T T NT T NextState 1 1 0 1

  35. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 0 1 1 0 1 1 Prediction NT T T NT T Reality T T NT T T NextState 1 1 0 1 1

  36. Branch Prediction When are we wrong????? for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 0 1 1 0 1 1 Prediction NT T T NT T T Reality T T NT T T NT NextState 1 1 0 1 1 0

  37. Branch Prediction When are we wrong????? First and last iteration of each loop for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 0 1 1 0 1 1 Prediction NT T T NT T T Reality T T NT T T NT NextState 1 1 0 1 1 0

  38. Two-bit Branch Predictor Must be wrong twice in a row to switch prediction Update the predictor for next time One wrong-> state 1 or 2, No wrong -> state 0 or 3 3 2 1 0 Predict Not Taken Predict Taken

  39. Two-bit Branch Predictor Must be wrong twice in a row to switch prediction Update the predictor for next time One wrong-> state 1 or 2, No wrong -> state 0 or 3 T NT 3 2 1 0 Predict Not Taken Predict Taken

  40. Two-bit Branch Predictor Must be wrong twice in a row to switch prediction Update the predictor for next time One wrong-> state 1 or 2, No wrong -> state 0 or 3 T NT NT 3 2 1 0 T Predict Not Taken Predict Taken

  41. Two-bit Branch Predictor Must be wrong twice in a row to switch prediction Update the predictor for next time One wrong-> state 1 or 2, No wrong -> state 0 or 3 T NT NT NT 3 2 1 0 T T Predict Not Taken Predict Taken

  42. Second Branch Predictor Must be wrong twice in a row to switch prediction Update the predictor for next time NT T NT NT NT 3 2 1 0 T T T Predict Not Taken Predict Taken

  43. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 2 Prediction Reality NextState

  44. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 2 3 Prediction T Reality T NextState 3

  45. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 2 3 3 Prediction T T Reality T T NextState 3 3

  46. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 2 3 3 2 Prediction T T T Reality T T NT NextState 3 3 2

  47. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 2 3 3 2 3 Prediction T T T T Reality T T NT T NextState 3 3 2 3

  48. Branch Prediction for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 2 3 3 2 3 3 Prediction T T T T T Reality T T NT T T NextState 3 3 2 3 3

  49. Branch Prediction When are we wrong????? for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 2 3 3 2 3 3 Prediction T T T T T T Reality T T NT T T NT NextState 3 3 2 3 3 2

  50. Branch Prediction When are we wrong????? Only when we exit the loop for(i; i<n;i++) slt $t1, $s2, $s3 do some work beq $t1, $0, end loop: do some work addi $s2, $s2, 1 slt $t1, $s2, $s3 bne $t1, $0, loop end: Iteration 1 2 … x 1 2 … y CurState 2 3 3 2 3 3 Prediction T T T T T T Reality T T NT T T NT NextState 3 3 2 3 3 2

  51. Simplest Branch Predictors • Memory indexed by lower portion of 01 address 11 PC 100........ 10110 00 • Entry contains few 00 . bits specifying . . prediction 10 01 • Accessed in IF stage 11 00 so fetching of target occurs in next cycle

  52. Real Branch Predictors • TargetPC saved with predictor • Limited space, so different branches may map to the same predictor w errors? • Prediction based on past behavior of several branches

  53. Advantages of 
 Branch Prediction • No extra instructions • Highly predictable branches have no stalls • Works well with loops. • All hardware - no compiler necessary

  54. Disadvantages/Limits of 
 Branch Prediction • Large penalty when wrong w Badly behaved branches kill performance • Only a few can be performed each cycle (only a problem in multi-issue machines)

  55. Minimizing Control Hazards

  56. Minimizing Control Hazards • Calculate branch in decode stage

  57. Minimizing Control Hazards • Calculate branch in decode stage • Branch delay slot

  58. Minimizing Control Hazards • Calculate branch in decode stage • Branch delay slot • Branch prediction

  59. CPI • CPI = ∑ ((% instr) × (cycles)) • How do hazards affect CPI? • How do branches affect CPI?

Recommend

The Challenge of Natural Hazards This PowerPoint will cover information on: Natural Hazards

The Challenge of Natural Hazards This PowerPoint will cover information on: Natural Hazards

The Challenge of Natural Hazards This PowerPoint will cover information on: Natural Hazards Tectonic Hazards Weather Hazards Climate Change NATURAL HAZARDS Natural hazards pose major risks to people and property Natural Hazards A

1.11k views • 61 slides
CSCI341 Lecture 36, Pipelining &amp; Hazards RECALL... RECALL... HAZARDS Data Hazards

CSCI341 Lecture 36, Pipelining &amp; Hazards RECALL... RECALL... HAZARDS Data Hazards

CSCI341 Lecture 36, Pipelining &amp; Hazards RECALL... RECALL... HAZARDS Data Hazards Control Hazards Dukes of Hazzard DATA HAZARD Hardware solution: Include forwarding paths in the machines datapath. Even though results have not

436 views • 27 slides
Health Hazards in Construction Health Hazards Potential exposures to health hazards: Worker

Health Hazards in Construction Health Hazards Potential exposures to health hazards: Worker

Health Hazards in Construction Health Hazards Potential exposures to health hazards: Worker on the job Workers family Source: OSHA Objectives 1. Identify common health hazards. 2. Describe types of common health hazards. 3. Apply

321 views • 27 slides
1 Checking Legality in Kelly &amp; Pugh Framework Loop Fusion Example (cont) For each dependence,

1 Checking Legality in Kelly &amp; Pugh Framework Loop Fusion Example (cont) For each dependence,

Loop Transformations for Parallelism &amp; Locality Loop Fusion Example Last time What are the dependences? Unimodular transformation framework do i = 1,n What are the dependences? Loop permutation s 1 A(i) = B(i) + 1 Loop

201 views • 3 slides
Model dependences, uncertain1es, and combined analysis Intro

Model dependences, uncertain1es, and combined analysis Intro

Model dependences, uncertain1es, and combined analysis Intro Cosmological neutrino mass limits are robust for a given, well-defined model, e.g., LCDM +mnu.

97 views • 7 slides
Key Points: Control Hazards Control hazards occur when we don t know what the next

Key Points: Control Hazards Control hazards occur when we don t know what the next

Key Points: Control Hazards Control hazards occur when we don t know what the next instruction is Caused by branches and jumps. Strategies for dealing with them Stall Guess! Leads to speculation Flushing the

657 views • 40 slides
EE 457 Unit 6c Control Hazards 2 Control Hazards Control (branch) hazards are named such

EE 457 Unit 6c Control Hazards 2 Control Hazards Control (branch) hazards are named such

1 EE 457 Unit 6c Control Hazards 2 Control Hazards Control (branch) hazards are named such because they deal with 40: BEQ $1,$3,28 issues related to program control 44: AND $12,$2,$5 instructions (branch, jump, 48: OR $13,$6,$2

704 views • 21 slides
Occupational Health Hazards PPT-SM-OCPHLTHHAZ 1 V.A.0.0 Occupational Health Hazards Three

Occupational Health Hazards PPT-SM-OCPHLTHHAZ 1 V.A.0.0 Occupational Health Hazards Three

Occupational Health Hazards PPT-SM-OCPHLTHHAZ 1 V.A.0.0 Occupational Health Hazards Three classes of occupational health hazards include 1. Chemical hazards 2. Biological hazards 3. Physical hazards PPT-SM-OCPHLTHHAZ 2 V.A.0.0 Chemical

499 views • 22 slides
Prandtl and Rayleigh numbers dependences in Rayleigh-B enard convection P.-E. Roche 1 , 2 , B.

Prandtl and Rayleigh numbers dependences in Rayleigh-B enard convection P.-E. Roche 1 , 2 , B.

1 June 2002 EUROPHYSICS LETTERS Europhys. Lett. , 58 (5), pp. 693698 (2002) Prandtl and Rayleigh numbers dependences in Rayleigh-B enard convection P.-E. Roche 1 , 2 , B. Castaing 1 , 3 , B. Chabaud 1 and B. H ebral 1 1 Centre de

89 views • 6 slides
Key Points: Control Hazards Control hazards occur when we dont know what the next

Key Points: Control Hazards Control hazards occur when we dont know what the next

Key Points: Control Hazards Control hazards occur when we dont know what the next instruction is Caused by branches and jumps. Strategies for dealing with them Stall Guess! Leads to speculation Flushing the

570 views • 32 slides
Using Predicate Path Information in Hardware to Determine True Dependences Lori Carter and Brad

Using Predicate Path Information in Hardware to Determine True Dependences Lori Carter and Brad

Using Predicate Path Information in Hardware to Determine True Dependences Lori Carter and Brad Calder University of California, San Diego June 26, 2002 Target EPIC Architecture LJCARTER UCSD E xplicitly P arallel I nstruction C

301 views • 29 slides
Natural Hazards Earthquakes Volcanoes Tsunamis Minimizing Damage Works Cited

Natural Hazards Earthquakes Volcanoes Tsunamis Minimizing Damage Works Cited

Slide 1 / 142 Slide 2 / 142 4th Grade Natural Hazards 2015-11-18 www.njctl.org Slide 3 / 142 Slide 4 / 142 Table of Contents Click on the topic to go to that section Natural Hazards Natural Hazards Earthquakes Volcanoes

657 views • 30 slides
Hazards Introduction Pipelining up until now has been ideal In real life, though, we

Hazards Introduction Pipelining up until now has been ideal In real life, though, we

Hazards Introduction Pipelining up until now has been ideal In real life, though, we might not be able to fill the pipeline because of hazards: Data hazards . For example, the result of an operation is needed before it is

413 views • 6 slides
Dependences for Parallelization Kaushik Rajan Abhishek Udupa William Thies Rigorous Software

Dependences for Parallelization Kaushik Rajan Abhishek Udupa William Thies Rigorous Software

, , , , , - 1 0 1 ALTER: Exploiting Breakable Dependences for Parallelization Kaushik Rajan Abhishek Udupa William Thies Rigorous Software Engineering

454 views • 20 slides
HAZARDS PROFILE FORM GUIDLINE Please read carefully and fill out the forms. Please use additional

HAZARDS PROFILE FORM GUIDLINE Please read carefully and fill out the forms. Please use additional

HAZARDS PROFILE FORM GUIDLINE Please read carefully and fill out the forms. Please use additional sheet of paper if you need more space. GENERAL HAZARDS INFORMATION: A community hazard analysis should focus on natural hazards (e.g. seismological

221 views • 4 slides
Identification, Prevention and Mitigation of Electrical Hazards Mitigation of Electrical Hazards

Identification, Prevention and Mitigation of Electrical Hazards Mitigation of Electrical Hazards

Identification, Prevention and Mitigation of Electrical Hazards Mitigation of Electrical Hazards Workshop on Managing Electrical Safety Risks April 2018, Kolkata Mudit Maheshwari Corporate EHS, ITC Limited, Kolkata Electrical Mishaps &amp;

764 views • 57 slides
Pipelining is Hazardous! Hazards are situations where pipelining does not work as elegantly as

Pipelining is Hazardous! Hazards are situations where pipelining does not work as elegantly as

Pipelining is Hazardous! Hazards are situations where pipelining does not work as elegantly as we would like Three kinds Structural hazards -- we have run out of a hardware resource. Data hazards -- an input is not available on

356 views • 22 slides
Technological advances in Detecting Microbial Hazards in Food. Rahul Warke Microbial Hazards

Technological advances in Detecting Microbial Hazards in Food. Rahul Warke Microbial Hazards

Technological advances in Detecting Microbial Hazards in Food. Rahul Warke Microbial Hazards Survival and growth of microorganisms in food processing environments may lead to contamination of the finished product that may, in turn result in

395 views • 20 slides
EE 457 Unit 6b Data Hazards 2 Data Hazards Consider the data dependencies in the following

EE 457 Unit 6b Data Hazards 2 Data Hazards Consider the data dependencies in the following

1 EE 457 Unit 6b Data Hazards 2 Data Hazards Consider the data dependencies in the following sequence SUB $2, $1, $3 The last four are all dependent on AND $12, $2, $5 register $2 OR $13, $6, $2 But because of pipelining

339 views • 32 slides
LECTURE 9 Pipeline Hazards PIPELINED DATAPATH AND CONTROL In the previous lecture, we

LECTURE 9 Pipeline Hazards PIPELINED DATAPATH AND CONTROL In the previous lecture, we

LECTURE 9 Pipeline Hazards PIPELINED DATAPATH AND CONTROL In the previous lecture, we finalized the pipelined datapath for instruction sequences which do not include hazards of any kind. Remember that we have two kinds of hazards to worry

975 views • 62 slides
Hazards 1 Today Quiz recap Quiz 2 correction Flash memory Data Hazards Watch

Hazards 1 Today Quiz recap Quiz 2 correction Flash memory Data Hazards Watch

Hazards 1 Today Quiz recap Quiz 2 correction Flash memory Data Hazards Watch for announcement about signing up for a project interview. Remember! There is a midterm next Tuesday that covers everything through this

464 views • 21 slides
Hazards hazard : previous instruction blocks following instruction structural hazards

Hazards hazard : previous instruction blocks following instruction structural hazards

Hazards hazard : previous instruction blocks following instruction structural hazards required resource is busy data hazard wait for previous instruction to complete its data read/write control hazard deciding on

1.3k views • 32 slides
Natural Hazards Return to Table of Contents Slide 5 / 142 What happened? Look at the picture

Natural Hazards Return to Table of Contents Slide 5 / 142 What happened? Look at the picture

Slide 1 / 142 Slide 2 / 142 4th Grade Natural Hazards 2015-11-18 www.njctl.org Slide 3 / 142 Table of Contents Click on the topic to go to that section Natural Hazards Earthquakes Volcanoes Tsunamis Minimizing Damage Works

720 views • 48 slides
3rd Grade Natural Hazards 2015-11-10 www.njctl.org Slide 3 / 53 Slide 4 / 53 Table of

3rd Grade Natural Hazards 2015-11-10 www.njctl.org Slide 3 / 53 Slide 4 / 53 Table of

Slide 1 / 53 Slide 2 / 53 3rd Grade Natural Hazards 2015-11-10 www.njctl.org Slide 3 / 53 Slide 4 / 53 Table of Contents Click on the topic to go to that section Natural Hazards Lightning Natural Hazards Floods Wildfires

417 views • 12 slides

More recommend