APAR status |
Closed as program error.
| Error description
Customer has noted that upon upgrading from WAS 2.0.3.X to WAS
3.5.X a severe degradation of performance, apparently related
to numerous System.out.println() entries. When those entries are
removed, the application runs as quickly as previously noted. Local fixProblem summary
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* USERS AFFECTED: WebSphere Application Server users of 3.5.6 *
* but may occur on previous 3.5 versions *
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* PROBLEM DESCRIPTION: System.out.println - buffering and *
* performance problem *
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* RECOMMENDATION: *
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In certain configurations, the system is not doing write
operation caching, which causes a massive amount of IO disk
calls. This would lead to the performance degradation noted
by the customer. Problem conclusion
The default behavior has been changed to not set the flag
FILE_FLAG_WRITE_THROUGH which turns off intermediate cache
and goes directly to disk. The system can still cache write
operations, but cannot lazily flush them. The flag can be
enabled by setting IMMEDIATE_LOGWRITE=TRUE in an environment
variable before invoking the server. In general, not setting
the flag should yield better performance. Temporary fixComments
APAR information | APAR number | PQ69279 | Reported component name | WAS STANDARD NT | Reported component ID | 5648C8301 | Reported release | 350 | Status | CLOSED PER | PE | NoPE | HIPER | NoHIPER | Submitted date | 2002-12-18 | Closed date | 2003-01-13 | Last modified date | 2003-05-05 |
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:APAR is sysrouted FROM one or more of the following:
PQ72332PQ73846
Modules/Macros
|
Fix information |
Fixed component name | WAS STANDARD NT | Fixed component ID | 5648C8301 | APAR is sysrouted TO one or more of the following:PQ72332PQ73846Modules/Macros
Applicable component levels | R350 PSY | UP |
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