On Wed, 3 Mar 2004, Stefan [iso-8859-1] Eßer wrote: > > I do not understand, why 'ratio' comes out that different (92-103% vs. 137-148%) > for 5.2.1 vs. -CURRENT (for -j4 and up, where HT plays a role). > > Is the process accounting different, or has the scheduler been changed to make > better use of logical processors ??? ULE is better in 5.2-CURRENT than in RELENG_5_2. However, the significant change that is contributing to this is the improvements to make(1). Prior to 5.2-CURRENT, 'make -jX' would poll every 20ms for completed children, and then schedule new children. Now there is a simplistic SIGCHILD handler that allows new children to be scheduled immediately, and of course eliminates the overhead of the polling. Since buildworld is such a large consumer of fork/exec, it's not surprising that this change helps a lot. ScottReceived on Wed Mar 03 2004 - 13:32:52 UTC
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