Hi, I am currently using squid 3.1.12 as forward-proxy without harddisk-caching (only RAM is used for caching). Each server is running on RHEL5.5 and is pretty strong (16 CPUs, 28GB RAM), but each servers starts swapping a few days after start. The workaround at the moment is to reboot the server once a week, which I don't really like. But swapping leads to serious side effects, e.g. performance troubles, ... way too much swapping: http://imageshack.us/m/52/6149/memoryday.png I already read a lot of posts and mails for similar problems, but unfortunately, I was not able to solve this problem. I added following infos to my squid.conf-file: # cache specific settings cache_replacement_policy heap LFUDA cache_mem 1600 MB memory_replacement_policy heap LFUDA maximum_object_size_in_memory 2048 KB memory_pools off cache_swap_low 85 cache_swap_high 90 (There are four squid instances per server, which means that 1600*4 = 6400MB RAM used for caching, which is not even 1/4 of the total available amount of RAM. Plenty enough, don't you think?) Very strange are the negative values (Memory usage for squid via mallinfo():) from the output below. Maybe that is a reason for running out of RAM? HTTP/1.0 200 OK Server: squid/3.1.12 Mime-Version: 1.0 Date: Wed, 11 May 2011 07:06:10 GMT Content-Type: text/plain Expires: Wed, 11 May 2011 07:06:10 GMT Last-Modified: Wed, 11 May 2011 07:06:10 GMT X-Cache: MISS from xlsqip03_1 Via: 1.0 xlsqip03_1 (squid/3.1.12) Connection: close Squid Object Cache: Version 3.1.12 Start Time: Wed, 27 Apr 2011 11:01:13 GMT Current Time: Wed, 11 May 2011 07:06:10 GMT Connection information for squid: Number of clients accessing cache: 1671 Number of HTTP requests received: 16144359 Number of ICP messages received: 0 Number of ICP messages sent: 0 Number of queued ICP replies: 0 Number of HTCP messages received: 0 Number of HTCP messages sent: 0 Request failure ratio: 0.00 Average HTTP requests per minute since start: 810.3 Average ICP messages per minute since start: 0.0 Select loop called: 656944758 times, 1.820 ms avg Cache information for squid: Hits as % of all requests: 5min: 17.4%, 60min: 18.2% Hits as % of bytes sent: 5min: 45.6%, 60min: 39.9% Memory hits as % of hit requests: 5min: 86.1%, 60min: 88.9% Disk hits as % of hit requests: 5min: 0.0%, 60min: 0.0% Storage Swap size: 0 KB Storage Swap capacity: 0.0% used, 0.0% free Storage Mem size: 1622584 KB Storage Mem capacity: 100.0% used, 0.0% free Mean Object Size: 0.00 KB Requests given to unlinkd: 0 Median Service Times (seconds) 5 min 60 min: HTTP Requests (All): 0.01648 0.01235 Cache Misses: 0.05046 0.04277 Cache Hits: 0.00091 0.00091 Near Hits: 0.01469 0.01745 Not-Modified Replies: 0.00000 0.00091 DNS Lookups: 0.00190 0.00190 ICP Queries: 0.00000 0.00000 Resource usage for squid: UP Time: 1195497.286 seconds CPU Time: 22472.507 seconds CPU Usage: 1.88% CPU Usage, 5 minute avg: 5.38% CPU Usage, 60 minute avg: 5.44% Process Data Segment Size via sbrk(): 3145032 KB Maximum Resident Size: 0 KB Page faults with physical i/o: 8634 Memory usage for squid via mallinfo(): Total space in arena: -1049140 KB Ordinary blocks: -1277813 KB 87831 blks Small blocks: 0 KB 0 blks Holding blocks: 2240 KB 5 blks Free Small blocks: 0 KB Free Ordinary blocks: 228673 KB Total in use: -1275574 KB 122% Total free: 228674 KB -22% Total size: -1046900 KB Memory accounted for: Total accounted: -1375357 KB 131% memPool accounted: 2818947 KB -269% memPool unaccounted: -3865847 KB 0% memPoolAlloc calls: 111 memPoolFree calls: 8322084644 File descriptor usage for squid: Maximum number of file descriptors: 1024 Largest file desc currently in use: 563 Number of file desc currently in use: 472 Files queued for open: 0 Available number of file descriptors: 552 Reserved number of file descriptors: 100 Store Disk files open: 0 Internal Data Structures: 96996 StoreEntries 96996 StoreEntries with MemObjects 96980 Hot Object Cache Items 0 on-disk objects Has anyone experienced similar things or does even know a solution? Thank you and best regards! Peter
