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documentation:iiswc2010_tutorial_flexus [2010/12/02 23:01] papamix |
documentation:iiswc2010_tutorial_flexus [2010/12/03 22:25] (current) mferdman |
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| - You can see how the source code inserts the magic instructions by looking at **spinlock.c** | - You can see how the source code inserts the magic instructions by looking at **spinlock.c** | ||
| - | - Create a new Simics script called break.simics and fill it in with this: | + | - Create a new Simics script called break.simics and fill it in with this: (this should already be available for you under ~/simics-3.0.22/targets/serengeti) |
| <code> | <code> | ||
| @def hap_callback(user_arg, cpu, arg): | @def hap_callback(user_arg, cpu, arg): | ||
| Line 128: | Line 128: | ||
| - Type **run** again and wait until the first thread starts to execute and triggers the magic breakpoint | - Type **run** again and wait until the first thread starts to execute and triggers the magic breakpoint | ||
| - Save a final checkpoint by typing **write-configuration ~/images/spinlock** | - Save a final checkpoint by typing **write-configuration ~/images/spinlock** | ||
| - | - **FINAL STEP**(for better performance in ProtoFlex). This final step is needed to maximum the performance of the underlying simulated I/O system. Simics is typically the initiator of DMA transactions, which occur at some bulk-sized granularity. This granularity is set by default to a very low value (64 Bytes) in default Simics checkpoints. Since Simics is a software-based simulator, issuing many small bulk transfers imposes no simulation overhead. In our system, large bulk transfers are far more desirable. To change this default setting, you will need to **EDIT** the checkpoint file and make one small change. Type the following commands: | + | - **FINAL STEP** (to prepare the checkpoint we will be using in the ProtoFlex part of the tutorial). This final step is needed to maximize the performance of the underlying simulated I/O system. Simics is typically the initiator of DMA transactions, which occur at some bulk-sized granularity. This granularity is set by default to a very low value (64 Bytes) in default Simics checkpoints. Since Simics is a software-based simulator, issuing many small bulk transfers imposes no simulation overhead. In our system, large bulk transfers are far more desirable. To change this default setting, you will need to **EDIT** the checkpoint file and make one small change. Copy theType the following commands: |
| <code> | <code> | ||
| - | cd ~/checkpoints | + | write-configuration ~/checkpoints/final |
| - | perl -pi -e 's/dma_block_size: 64/dma_block_size: 8192/' final | + | quit |
| + | perl -pi -e 's/dma_block_size: 64/dma_block_size: 8192/' ~/checkpoints/final | ||
| </code> | </code> | ||
| Line 139: | Line 140: | ||
| ======3. Working with Flexus====== | ======3. Working with Flexus====== | ||
| - | From the simics checkpoint you just created, you will get a chance to run some sample jobs with Flexus and create a Flexpoint library. By this point you should have a valid initial checkpoint stored as **~/images/spinlock**. | + | From the simics checkpoint you just created, you will get a chance to run some sample jobs with Flexus. By this point you should have a valid initial checkpoint stored as **~/images/spinlock**. |
| - Before starting, you should have a few initial directories in the home (which we will explain in the next steps):<code> | - Before starting, you should have a few initial directories in the home (which we will explain in the next steps):<code> | ||
| Line 182: | Line 183: | ||
| Run a "spinlock" trace job with CMP.L2Shared.Trace | Run a "spinlock" trace job with CMP.L2Shared.Trace | ||
| * **run_job -run trace -cfg 4cores -local CMP.L2Shared.Trace spinlock** | * **run_job -run trace -cfg 4cores -local CMP.L2Shared.Trace spinlock** | ||
| - | * Explanation of "local": -local requests to run a batch of jobs locally. without -local an interactive run is assumed which waits at the simics> prompt instead of running. | + | * Explanation of "local": -local requests to run a batch of jobs locally. without -local an interactive run is assumed which waits at the simics> prompt instead of running. |
| - | * Explanation of "remote": -remote will submit jobs to a remote cluster (e.g., Condor, PBS, etc...) [not available for the tutorial]. | + | * Explanation of "remote": -remote will submit jobs to a remote cluster (e.g., Condor, PBS, etc...) [not available for the tutorial]. |
| + | * You can **run** simulation, interrupt it with **ctrl+c**, and change debug severity with **flexus.debug-set-severity iface**. | ||
| ++++ | ++++ | ||
| - | ====Displaying statistics through the stat-manager tool==== | + | ====Displaying statistics with the stat-manager tool==== |
| ++++CLICK - Expand/Collapse| | ++++CLICK - Expand/Collapse| | ||
| Find the run directory for the trace job in ~/results/ and examine the resulting statistics database: | Find the run directory for the trace job in ~/results/ and examine the resulting statistics database: | ||
| Line 197: | Line 199: | ||
| * **~/tutorial_files/flexus_v4/stat-manager/stat-manager -per-node print 'Region 001' | less** | * **~/tutorial_files/flexus_v4/stat-manager/stat-manager -per-node print 'Region 001' | less** | ||
| ++++ | ++++ | ||
| + | |||
| + | ====Running timing simulations==== | ||
| + | ++++CLICK - Expand/Collapse| | ||
| + | Run a "spinlock" timing job with CMP.L2SharedNUCA.OoO | ||
| + | * **run_job -run timing -cfg 4cores -ma CMP.L2SharedNUCA.OoO spinlock** | ||
| + | * NOTE: When running timing simulations, one must pass the **-ma** parameter to Simics. | ||
| + | * You can **run** simulation, interrupt it with **ctrl+c**, and change debug severity with **flexus.debug-set-severity iface**, **run 10** will run 10 cycles on all CPUs. | ||
| + | * Rebuild the simulator with **vverb** debug output (CMP.L2SharedNUCA.OoO-vverb) and try running simulation with **flexus.debug-set-severity vverb** to see the detailed debug output. | ||
| + | ++++ | ||
| + | |||
| + | ======4. Using Statistical Sampling with Flexus====== | ||
| ====Creating a flexpoint library==== | ====Creating a flexpoint library==== | ||
