Re: squid-1.2-SQUIDFS

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Stephen R. van den Berg wrote:
 
> But, using one FD, and mmapping multiple parts of this file/device in
> different places allows for async io without the use of more than
> one filedescriptor per filesystem.

Possibly, if you utilize threads to trigger the needed pagefaults.

But I am afraid that using mmap is not suitable for Squid as it
increases the VM paging and may generate a lot of pagefaults for the
main Squid process as well. The VM based file I/O may push parts of
Squid out on swap unless you have a lot of memory available.

Some OS:es uses VM paging for plain file I/O and have these problems
regardless of what we do (I beleive Solaris is one of them).

/Henrik

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Received on Tue Jul 29 2003 - 13:15:50 MDT