hi,
i am using j2re1.4.2 for linux (redhat9.0).
i cannot seem to use the -XX:+UseParallelGC option. when i use it
the application starts to run, but is get stuck in the middle of a gc (after
completing a few garbage collection cycles).
i have tried to use -XX:+UseParallelGC in several ways, such as:
java -server -XX:+UseParallelGC
or
java -XX:+UseParallelGC
thanks in advance,
Harel
Hi
Which particular version of 1.4.2?
Any chance u can run pstack or its linux equivalent to get the native stack when it is stuck? Also, add -XX:+PrintGC -XX:+PrintGCDetails, usually, most applications can live with default collectors, use parallel GC only if u really want to tweak ur application performance.
Hope this helps.
Hi
>Which particular version of 1.4.2?
i have tried both the 4'th and the 5'th update of 1.4.2. i have also tried 1.5, and 1.4.1. in all versions- no luck.
this is what i get when running with -verbose:gc
[GC 54587K->46875K(498880K), 0.1512810 secs]
[GC 55771K->26131K(498880K), 0.0711950 secs]
[GC 56723K->49235K(499904K), 0.1079090 secs]
[GC 56787K->26195K(499904K), 0.1108160 secs]
[GC 58835K->50835K(500864K), 0.1187630 secs]
[GC 58963K->26355K(500864K), 0.0728150 secs]
[GC 60915K->51619K(501824K), 0.1301180 secs]
[GC
Suspended
>$ kill %2
>$ 60963K->26371K(501824K), 369.2696540 secs]
Timing Measurement began Fri Sep 24 12:01:05 IST 2004 for 2 minutes
>
as you can see it get stack in a middle of a GC. when i suspend it and then kill it, it first get out of the gc cycle and then dies.
>usually, most applications can live with default collectors, use parallel GC only if u really want to tweak ur >application performance.
the default collector works fine. however, since the application is multi-threaded, and my machine has 4 processors, i want to use parallel gc (to improve performance).
thanks,
Harel
