Okay, to follow up. I still cannot reproduce this in a lab environment, but I have implemented a way of doing what Alex described on the production machine. I run two instances of Squid with the same config and switch the transparent proxy out by changing the redirect rules in iptables. The second instance is running without a cache_dir though, to prevent the possibility of two instances sharing the same directory and running amok. If requested, I can create a second cache_dir for the second instance to mimic the config entirely. While running under this configuration, I've confirmed that memory usage does go up when active, and stays at that level when inactive, allowing some time for timeouts and whatnot. I'm currently switching between the two instances every fifteen minutes. Here is a link to the memory graph for the entire running time of the second process, at 1 minute intervals: http://getoffmalawn.com/static/mem-graph.png. The graph shows memory use steadily increasing during activity, but remaining reasonably stable during inactivity. Where shall we go from here? Given that I can switch between the instances, impacting performance on the production box is not of huge concern now, so I can run the second instance under Valgrind, or bump up the debug logging, or whatever would be helpful. As an aside, I've been reading some of the code pointed at by traces I've got, and I've stumbled upon the fact that nearly every caller of StoreEntry::replaceHttpReply will leak HttpReply objects if the internal mem_obj pointer of a StoreEntry is set to NULL. There's a critical log message that occurs in this situation which I have not seen, so I can conclude that this is not the issue I am seeing, but it's an issue nonetheless. If there's interest, I'll submit a patch for this issue. Many thanks, Nathan. -- Nathan Hoad Software Developer www.getoffmalawn.com On Sat, Dec 14, 2013 at 8:11 PM, Nathan Hoad <nathan@xxxxxxxxxxxxxxxx> wrote: > On Fri, Dec 13, 2013 at 10:33 PM, Eliezer Croitoru <eliezer@xxxxxxxxxxxx> wrote: >> Hey Nathan, >> >> I am looking for more details on the subject in hand in the shape of: >> Networking Hardware > > Straight out of lspci: > > 02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5722 > Gigabit Ethernet PCI Express > 03:01.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5703 > Gigabit Ethernet (rev 10) > > Two network cards - one for internal traffic, the other for external. > >> Testing Methods > > - a mixture of direct and intercepted HTTP and HTTPS traffic, hitting > the configured ICAP server and not. > - both valid and invalid upstream SSL certificates, hundreds of > concurrent requests from a single client > - thrashing Squid with thousands of connections that are aborted > after 800ms, running for ~30-40 seconds at a time. > - currently I'm putting the week's access.log through Squid to see if > that triggers it, for a poor approximation of the traffic. > >> Is it a SMP squid setup? > - both SMP (2 workers) and non-SMP. > >> In the case you use a 32bit system which is limited to how much ram??(I >> remember something about a windows nt with 64GB). > > - This particular host has 3gb of RAM. Previously running a non-SMP > Squid 3.2.13 instance and according to logs, maxed out at ~500mb of > resident after running for hours or days at a time, with a 220mb > cache_mem. Now, however the memory usage grows to 900mb in ~40 > minutes, and typically reaches 1.5gb in ~4 hours. We have a ulimit in > place to kill it once it hits 1.5gb, but prior to putting that in > place it typically reached 2gb. > >> >> If you can provide more details I will be happy to try and test it. >> >> Thanks, >> Eliezer > > If there's any other information you think may be useful, feel free to ask.
