Re: Performance of madvise / msync

:With madvise() and without msync(), there are high numbers of :faults, which matches the number of disk io operations. It :goes through cycles, every once in a while stalling while about :60MB of data is dumped to disk at 20MB/s or so (buffers flushing?) :At the beginning of each cycle it's

Performance of madvise / msync

Hi, I'm using py-rrdtool 0.2.1 with rrdtool 1.3.0 under 7.0-STABLE, and there's a couple of things about this new version of rrdtool that hurt performance under FreeBSD, but apparently help on whatever they tested on. For every update, the database file is opened, mapped into memory, madvise()

Re: Performance of madvise / msync

: 65074 python 0.06 CALL madvise(0x287c5000,0x70,_MADV_WILLNEED) : 65074 python 0.027455 RET madvise 0 : 65074 python 0.58 CALL madvise(0x287c5000,0x1c20,_MADV_WILLNEED) : 65074 python 0.016904 RET madvise 0 : 65074 python 0.000179 CALL

Re: Performance of madvise / msync

On Thu, Jun 26, 2008 at 05:48:13PM -0700, Matthew Dillon wrote: : 65074 python 0.06 CALL madvise(0x287c5000,0x70,_MADV_WILLNEED) : 65074 python 0.027455 RET madvise 0 : 65074 python 0.58 CALL madvise(0x287c5000,0x1c20,_MADV_WILLNEED) : 65074 python 0.016904 RET