Re: [perf-discuss] slow read on NFS (netapp), but why file system cache doesn't help?

2010-04-11 Thread Qihua Wu
hoping solaris could use all the free memory effectively, so that it can cache all the data unless there is not enough free memory. Thanks, On Mon, Apr 12, 2010 at 11:20 AM, Richard Elling wrote: > more below... > > On Apr 11, 2010, at 6:14 PM, Qihua Wu wrote: > > > Thank Richar

Re: [perf-discuss] slow read on NFS (netapp), but why file system cache doesn't help?

2010-04-11 Thread Qihua Wu
Thank Richard, We used netapp as standby database, the write performance looks like good as the recovery can catch up(might because the write anywhere feature is optimized to write). But read is very slow, not matter which datafile. But we mainly care the read performance about one file: the contr

[perf-discuss] question about creation of a new segment (virtual memory)

2009-05-18 Thread Qihua Wu
During the life of a process, lots of segments might be created and destroyed, so there might be many hole inside the address space, suppose we need to allocate a segment (use mmap to create a anonymous meomry) whose size is 10M, but the first 1000 holes in address space solaris could find is only

[perf-discuss] real meaning of ithr from mpstat

2009-05-12 Thread Qihua Wu
>From the man page, ithr is "interrupts as threads", but what's the detailed meaning of "interrupts as threads"? And under what condition will this interrupt happen? On our system, cpu 7 have more sys cpu than other cpu, looks like on this cpu, ithr is much more than other cpu. CPU minf mjf xcal