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From "Aleksey Shipilev (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5095) [drlvm][build] Enable /O2 for VM building with MSVC
Date Thu, 08 Nov 2007 12:38:50 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12541039
] 

Aleksey Shipilev commented on HARMONY-5095:
-------------------------------------------

On GC microbenchmark:

>>> MSVC default
Measurement time: 10
          cycles: 20
     from thread: 16
       to thread: 16
     working set: 1000000

Starting 16 worker threads...
 throughput: 2031622.0 Kb/sec
 throughput: 2199359.0 Kb/sec
 throughput: 2206058.0 Kb/sec
 throughput: 2191359.0 Kb/sec
 throughput: 2169461.0 Kb/sec
 throughput: 2157661.0 Kb/sec
 throughput: 2201959.0 Kb/sec
 throughput: 2199259.0 Kb/sec
 throughput: 2189955.0 Kb/sec
 throughput: 2195759.0 Kb/sec
 throughput: 2201759.0 Kb/sec
 throughput: 2196859.0 Kb/sec
 throughput: 2205758.0 Kb/sec
 throughput: 2179160.0 Kb/sec
 throughput: 2191845.0 Kb/sec
 throughput: 2203158.0 Kb/sec
 throughput: 2186860.0 Kb/sec
 throughput: 2189359.0 Kb/sec
 throughput: 2200659.0 Kb/sec
 throughput: 2197459.0 Kb/sec

Results for 16 threads: 
======================================
Final GC throughput: 2195287 Kb/sec, (uncert: 0.06%)
 persistent objects: 15 Mb
        new objects: 416840 Mb
       transactions: 2 TPS

>>> MSVC /O2

Measurement time: 10
          cycles: 20
     from thread: 16
       to thread: 16
     working set: 1000000

Starting 16 worker threads...
 throughput: 2067958.0 Kb/sec
 throughput: 2254855.0 Kb/sec
 throughput: 2247456.0 Kb/sec
 throughput: 2252155.0 Kb/sec
 throughput: 2229957.0 Kb/sec
 throughput: 2247356.0 Kb/sec
 throughput: 2235956.0 Kb/sec
 throughput: 2234556.0 Kb/sec
 throughput: 2231557.0 Kb/sec
 throughput: 2251055.0 Kb/sec
 throughput: 2252555.0 Kb/sec
 throughput: 2252255.0 Kb/sec
 throughput: 2239956.0 Kb/sec
 throughput: 2248756.0 Kb/sec
 throughput: 2231557.0 Kb/sec
 throughput: 2246656.0 Kb/sec
 throughput: 2260455.0 Kb/sec
 throughput: 2259155.0 Kb/sec
 throughput: 2234956.0 Kb/sec
 throughput: 2246756.0 Kb/sec

Results for 16 threads: 
======================================
Final GC throughput: 2247305 Kb/sec, (uncert: 0.067%)
 persistent objects: 15 Mb
        new objects: 426571 Mb
       transactions: 2 TPS


> [drlvm][build] Enable /O2 for VM building with MSVC
> ---------------------------------------------------
>
>                 Key: HARMONY-5095
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5095
>             Project: Harmony
>          Issue Type: Improvement
>          Components: build - test - ci
>         Environment: Windows
>            Reporter: Aleksey Shipilev
>            Priority: Minor
>         Attachments: drlvm-o2.patch
>
>
> At the moment the build system passes the /Ox parameter instead of /O2 to MSVC compiler.
> Attached patch adds /O2 switch for common_vm build target when using MSVC compiler.

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