Hugh Dickins wrote:
On Wed, 6 Feb 2008, H. Peter Anvin wrote:
That sounds like a problem in our overall swap handling, not specifically in
tmpfs. Now, I can't say anything concrete about heavy swap conditions, but in
light swap conditions I have measured a 20x performance improvement(!) over
ext3 on real workloads.
Wow, I'm surprised. I suppose I do jump to thinking of heavy swapping
when light swapping won't be so bad; but even so, 20x ext3 astonishes
me - ext3 wouldn't be anyone's choice for fastest, but even so...
I certainly guess too much and measure too little:
is there a useful test you could point me to? TIA
The specific application was this:
- extract a kernel tarball
- "make distclean"
- cp -al the resulting tree
- apply a patch to each tree
- do a diff between the trees
- delete all files
... repeat something like 20,000 times.
-hpa
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