Withdrawn: CODETOOLS-7902854: jcstress: Print generated code assembly (optionally)

[Aleksey Shipilev]

On Thu, 18 Mar 2021 15:39:37 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Following up on test failures is hard without the generated code. Doing -XX:+PrintAssembly would print the generated code for everything, which would be unnecessarily noisy. Luckily, we can now instruct jcstress to dump the generated code for the hot loops only.
> 
> Sample output:
> 
> $ java -jar tests-custom/target/jcstress.jar -t UnfencedDekker -vv --jvmArgs "-XX:-TieredCompilation"
> Java Concurrency Stress Tests
> ---------------------------------------------------------------------------------
> Rev: 728c24c414d9b9c2, built by shade with 11.0.12-testing at 2021-03-18T15:36:51Z
> 
> Burning up to figure out the exact CPU count....... done!
> 
> Probing the target OS:
>  (all failures are non-fatal, but may affect testing accuracy)
> 
> ----- [OK] Trying to set affinity with taskset
> 
> Initializing and probing the target VM: 
>  (all failures are non-fatal, but may affect testing accuracy)
> 
> ----- [OK] Unlocking diagnostic VM options
> ----- [OK] Trimming down the default VM heap size to 1/64-th of max RAM
> ----- [OK] Trimming down the number of compiler threads
> ----- [OK] Trimming down the number of parallel GC threads
> ----- [OK] Trimming down the number of concurrent GC threads
> ----- [OK] Trimming down the number of G1 concurrent refinement GC threads
> ----- [OK] Testing @Contended works on all results and infra objects
> ----- [OK] Unlocking Whitebox API for online de-optimization: all methods
> ----- [OK] Unlocking Whitebox API for online de-optimization: selected methods
> ----- [OK] Unlocking C2 local code motion randomizer
> ----- [OK] Unlocking C2 global code motion randomizer
> ----- [OK] Unlocking C2 iterative global value numbering randomizer
> ----- [OK] Unlocking C2 conditional constant propagation randomizer
> ----- [OK] Testing allocation profiling
> ----- [OK] Testing Thread.onSpinWait
> ----- [OK] Testing PrintAssembly
> ----- [OK] Testing compiler directives
> 
> Probing what VM modes are available:
>  (failures are non-fatal, but may miss some interesting cases)
> 
> ----- [OK] [-XX:-TieredCompilation]
> 
>   Hardware CPUs in use: 64, using Thread.onSpinWait()
>   Test preset mode: "default"
>   Writing the test results to "jcstress-results-2021-03-18-16-37-38.bin.gz"
>   Parsing results to "results/"
>   Running each test matching "UnfencedDekker" for 1 forks, 5 iterations, 1000 ms each
>   Solo stride size will be autobalanced within [10, 10000] elements, but taking no more than 100 Mb.
> 
>   Attached the non-interactive output stream.
>   Printing the progress line at least every 15000 milliseconds.
> 
> 
>       [OK] o.o.j.t.fences.UnfencedDekkerTest
>     (fork: #1, JVM args: [-XX:-TieredCompilation])
>   Observed state   Occurrences              Expectation  Interpretation                                              
>             0, 0     8,376,544   ACCEPTABLE_INTERESTING  Acceptable with no sequential consistency enforced          
>             0, 1   476,317,773               ACCEPTABLE  Acceptable under sequential consistency                     
>             1, 0   218,828,395               ACCEPTABLE  Acceptable under sequential consistency                     
>             1, 1           799               ACCEPTABLE  Acceptable under sequential consistency                     
> 
>     VM output stream: 
>         
>         ============================= C2-compiled nmethod ==============================
>         ----------------------------------- Assembly -----------------------------------
>         
>         Compiled method (c2)     222  128 %           org.openjdk.jcstress.tests.fences.UnfencedDekkerTest_jcstress::run_actor1 @ 12 (55 bytes)
>          total in heap  [0x00007f783863b110,0x00007f783863b7a8] = 1688
>          relocation     [0x00007f783863b270,0x00007f783863b2a0] = 48
>          main code      [0x00007f783863b2a0,0x00007f783863b5e0] = 832
>          stub code      [0x00007f783863b5e0,0x00007f783863b5f8] = 24
>          oops           [0x00007f783863b5f8,0x00007f783863b600] = 8
>          metadata       [0x00007f783863b600,0x00007f783863b630] = 48
>          scopes data    [0x00007f783863b630,0x00007f783863b6f8] = 200
>          scopes pcs     [0x00007f783863b6f8,0x00007f783863b788] = 144
>          dependencies   [0x00007f783863b788,0x00007f783863b790] = 8
>          nul chk table  [0x00007f783863b790,0x00007f783863b7a8] = 24
>         
>         --------------------------------------------------------------------------------
>         [Constant Pool (empty)]
>         
>         --------------------------------------------------------------------------------
>         
>         [Verified Entry Point]
>           # {method} {0x00007f7825812658} 'run_actor1' '([Lorg/openjdk/jcstress/tests/fences/UnfencedDekkerTest;[Lorg/openjdk/jcstress/infra/results/II_Result;)V' in 'org/openjdk/jcstress/tests/fences/UnfencedDekkerTest_jcstress'
>           0x00007f783863b2a0:   callq  0x00007f784a5a1120           ;   {runtime_call os::breakpoint()}
>           0x00007f783863b2a5:   data16 data16 nopw 0x0(%rax,%rax,1)
>           0x00007f783863b2b0:   mov    %eax,-0x14000(%rsp)
>           0x00007f783863b2b7:   push   %rbp
>           0x00007f783863b2b8:   sub    $0x40,%rsp
>           0x00007f783863b2bc:   mov    0x40(%rsi),%r10
>           0x00007f783863b2c0:   mov    %r10,(%rsp)
>           0x00007f783863b2c4:   mov    0x28(%rsi),%rbp
>   ...

This pull request has been closed without being integrated.

-------------

PR: https://git.openjdk.java.net/jcstress/pull/14