Hi Ian, I am facing the same issue. The CPU usage on my servers increases from very low to 100% of CPU. Did you find the solution to your problem?
go version : 1.10.1 OS : centOS Thanks, On Thursday, January 31, 2013 at 7:27:33 AM UTC+5:30, Ian Ragsdale wrote: > > Thanks Dave, those look like great suggestions. I'm running Go 1.0.3 on > Ubuntu: > > # go version > > > go version go1.0.3 > > # uname -a > Linux 4bf343d4-786f-4fa6-b37c-8bdd018fc63b 2.6.32-350-ec2 #57-Ubuntu SMP > Thu Nov 15 15:59:03 UTC 2012 x86_64 GNU/Linux > > I'll work on gathering the SIGQUIT & GOGCTRACE output - didn't know about > those techniques. I can't really share the source, and I'm not sure if > there's a good way to cut it down to a sharable chunk, but I'll give it a > shot. Strace was going to be my next move. > > I think your theory in general makes sense, as I'm familiar with that kind > of failure, but if that was the case, would it not immediately shoot up to > 100% cpu usage as soon as the problem occurred? In this situation, the cpu > usage creeps up quite slowly, in a nearly perfect linear fashion over the > course of many hours. > > - Ian > > On Jan 30, 2013, at 4:00 PM, Dave Cheney <da...@cheney.net <javascript:>> > wrote: > > > Can you please provide the following details > > * your Go version and operating system details > * the full output from the process when sent a SIGQUIT, once it entered > the high CPU usage scenario. > * the full output from running the process with GOGCTRACE=1 as above. > * the source, I possible, or at least a sample that reproduces the issue. > * if you are using Linux, try running the process under the perf(1) tool. > * if you able, try running the process under strace(1). > > My gut feeling is your code, or a library is not checking an error code > from a socket operation and entering into a tight loop. If this is the case > temporarily breaking the networking on this host may induce the failure. > > > > -- ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- This message is intended only for the use of the addressee and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this e-mail in error, please notify us immediately by return e-mail and delete this e-mail and all attachments from your system. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
