Another notice on squid memory usage

Hello everybody!

I run squid 1.1.18 on FreeBSD 2.2.2. It is linked against GNU malloc.

Now my cache swap contains about 700,000 objects, and after squid
restart I get the following mstats :-)

=====
...
        Maximum Resident Size: 187672 KB
        Page faults with physical i/o: 78
Memory usage for squid via mstats():
        Total space in arena: 196928 KB
        Total free: 105803 KB 54%
...

Accounted Memory Usage:
        StoreEntry 673445 x 52 bytes = 34198 KB
        URL strings = 31425 KB
        IPCacheEntry 42 x 36 bytes = 1 KB
        FQDNCacheEntry 0 x 56 bytes = 0 KB
        Hash link 1 x 12 bytes = 0 KB
        Pool MemObject structures 76 x 100 bytes = 7 KB ( 0 free)
        Pool for Request structur 70 x 4536 bytes = 310 KB ( 0 free)
        Pool for in-memory object 13 x 4096 bytes = 52 KB ( 0 free)
        Pool for disk I/O 23 x 8192 bytes = 184 KB ( 0 free)
        NetDB Address Entries 0 x 76 bytes = 0 KB
        NetDB Host Entries 0 x 8 bytes = 0 KB
        NetDB Peer Entries 0 x 24 bytes = 0 KB
        ClientDB Entries 1 x 292 bytes = 0 KB
        Miscellaneous = 1674 KB
        Total Accounted = 67853 KB
=====

I was observing the same thing with standard FreeBSD malloc (that
squid's size in memory is twice its accounted size)

It seems that squid's behaviour causes a heavy fragmentation of the arena...

I went doing RTFS...

SY, Yar
Received on Thu Dec 18 1997 - 11:41:47 MST