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Futex_wait_bitset_private Etimedout (connection Timed Out)


If another thread changed the value of the futex word after the calling thread decided to block based on the prior value, and if the other thread executed a FUTEX_WAKE operation Also i found that when blocked, gc threads kept calling futex(), but failed. The alternative here would be to employ the equivalent atomic machine-language instructions. If this value is greater than val, then difference is the number of waiters requeued to the futex for the futex word at uaddr2. navigate here

This inheritance follows the lock chain in the case of nested locking and performs deadlock detection. Several higher-level programming abstractions are implemented via futexes, including POSIX semaphores and various POSIX threads synchronization mechanisms (mutexes, condition variables, read-write locks, and barriers). Coding Forums Forums > Archive > Archive > Java > Forums Forums Quick Links Search Forums Recent Posts Members Members Quick Links Notable Members Current Visitors Recent Activity New Profile Posts Is there any way to take stable Long exposure photos without using Tripod? get redirected here

Futex_wait_bitset_private Etimedout (connection Timed Out)

what if you enable heartbeats? Typical values to specify for val are 0 or 1. (Specifying INT_MAX is not useful, because it would make the FUTEX_CMP_REQUEUE operation equivalent to FUTEX_WAKE.) The limit value specified via val2 FUTEX_CMP_REQUEUE_PI (since Linux 2.6.31) This operation is a PI-aware variant of FUTEX_CMP_REQUEUE.

Member michaelklishin commented Apr 16, 2013 @sgzijl posting strace output of the process and trying to reproduce it with the script posted above would help a lot. Use kill -3 PID (this way thread dump will be in the standard output of the process) or $JDK_HOME/bin/jstack PID (this way output will be on your screen but a bit If the timeout is not NULL, the structure it points to specifies a timeout for the wait. (This interval will be rounded up to the system clock granularity, and is guaranteed Futex_wait_private I am going to run with the -XX:UseSerialGC and multiple vCPUs to see if everything appears stable.

I'll see if I can reduce the number of processes a bit to see if that makes any difference. What Is Futex If there are more than val waiters, then the remaining waiters are removed from the wait queue of the source futex at uaddr and added to the wait queue of the ESRCH (FUTEX_LOCK_PI, FUTEX_TRYLOCK_PI, FUTEX_CMP_REQUEUE_PI) The thread ID in the futex word at uaddr does not exist. What is the best way to have a forever running process with bunny-listeners?

What am I doing wrong? Futex_wake_private rasputnik commented Mar 13, 2013 Sorry, did say - this is still an issue on 0.9.0pre8. The uaddr2 and timeout arguments are ignored. Top Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending Post Reply Print view 7 posts • Page 1 of 1 Return

What Is Futex

Thanks. http://serverfault.com/questions/407224/java-process-opends-consumes-all-cpu-futex-flood-how-to-debug-futex VERSIONS top Futexes were first made available in a stable kernel release with Linux 2.6.0. Futex_wait_bitset_private Etimedout (connection Timed Out) You can not post a blank message. Futex Wait There used to be some futex-related hangs with some combinations of Java and glibc on Linux that could be worked around by setting LD_ASSUME_KERNEL appropriately, perhaps this is related.

If you set hearbeat interval to a low value (say, 10 seconds), does it reproduce the issue? http://juicecoms.com/connection-timed/deferred-connection-timed-out-with-sendmail.html Not the Java >sources. A futex overview and update, ⟨http://lwn.net/Articles/360699/⟩ Hart, D. A fifth argument was added in Linux 2.5.70, and a sixth argument was added in Linux 2.6.7. Futex Example

When executing a futex operation that requests to block a thread, the kernel will block only if the futex word has the value that the calling thread supplied (as one of This bit mask, in which at least one bit must be set, is stored in the kernel- internal state of the waiter. If I cannot, I will contact you in a private message to your community account so that I can get some additional information. http://juicecoms.com/connection-timed/connection-timed-out-110-shoutcast.html Mike, Jun 28, 2003, in forum: Java Replies: 0 Views: 1,323 Mike Jun 28, 2003 Reader on top of RandomAccessFile Harald Kirsch, Aug 21, 2003, in forum: Java Replies: 0 Views:

ENOMEM (FUTEX_LOCK_PI, FUTEX_TRYLOCK_PI, FUTEX_CMP_REQUEUE_PI) The kernel could not allocate memory to hold state information. Futex_wait_private Etimedout In all of these cases, the root-cause turned out to be a configuration issue in their environment, and not really related to Java itself. But, I did some further investigation and wanted to share what I've found so far.

Re: Java Performance on VMware ESX tcutts Aug 4, 2009 6:36 AM (in response to tommyodom) tommyodom wrote:For what it is worth, I too have been seeing these problems trying to

Keeping windshield ice-free without heater Parking lot supervisor How did Adebisi make his hat hanging on his head? I don't know whether these are valid for ESX 3.5, but since your problem seems to be related to timekeeping, I would suggest giving them a try. For several blocking operations, the timeout argument is a pointer to a timespec structure that specifies a timeout for the operation. Futex_wait Java In the meantime, to rule out memory-overcommit issues, which can cause problems with Java applications, can you try re-running your 2 vCPU case, but set a memory reservation for the VM

this is not a dyadic cosine-product Why didn't Dumbledore appoint the real Mad Eye Moody to teach Defense Against Dark Arts? when I strace the system call, find the system call is much quicker returned than 1 second. Because it was inherently racy, FUTEX_FD has been removed from Linux 2.6.26 onward. http://juicecoms.com/connection-timed/connection-timed-out-firefox.html FUTEX_TRYLOCK_PI (since Linux 2.6.18) This operation tries to acquire the lock at uaddr.

Member michaelklishin commented Apr 22, 2013 The following OpenVZ bug may be relevant, the system is running $ uname -a Linux rails 2.6.32-14-pve #1 SMP Tue Aug 21 08:24:37 CEST 2012 Therefore, callers should always conservatively assume that a return value of 0 can mean a spurious wake-up, and use the futex word's value (i.e., the user-space synchronization scheme) to decide whether The application just isn't responding sensibly to web requests at all, but when I log into the VM and run top, I see the tomcat server using about 30% CPU, and I restarted one of the machines and it's all back to normal again.

Re: Java Performance on VMware ESX tommyodom Jul 22, 2009 12:11 PM (in response to tommyodom) Well I tried those settings on my Glassfish installation but still no luck, I guess DESCRIPTION top The futex() system call provides a method for waiting until a certain condition becomes true. All reads were being served from the buffer cache (verified by running iostat). Futex operations The futex_op argument consists of two parts: a command that specifies the operation to be performed, bit-wise ORed with zero or more options that modify the behaviour of the

By using strace -f -c -p pid to collect syscall info, i found that. The 3rd one is outside of the scope of this GH issue. Please join our friendly community by clicking the button below - it only takes a few seconds and is totally free. For those knowledgable about the 'open sourcing' of Java - just how much of Java does that include, is it only the (already available via.

It also looks like the > >52 ms is a futex timeout but strace doesn't report which system call > >causes this. futex resumed> ) = 0 futex(0x7f63fd8de328, FUTEX_WAKE_PRIVATE, 1) = 0 sendto(8, "\0\361\0&\20\376\200\0\0\0\0\0\0\2PV\377\376\236a\263\0\0\233-\1\2\243\254\355\0\5s"..., 1055, 0, {sa_family=AF_INET6, sin6_port=htons(59659), inet_pton(AF_INET6, "fe80::250:56ff:fe9e:61b3", &sin6_addr), sin6_flowinfo=32768, sin6_scope_id=if_nametoindex("lo")}, 28 <... Top amol Posts: 3 Joined: 2012/06/22 07:29:46 Re: [SOLVED] java using 100% cpu on CentOS/RHEL 6 Quote Postby amol » 2012/07/27 11:43:35 The problem was solved after upgrading kernel to kernel-2.6.32-220 sgzijl commented Apr 16, 2013 Having exactly the same issue on rabbitmq 3.0.4 with 0.9.0pre8.

When releasing the lock, a thread has to first reset the lock state to not acquired and then execute a futex operation that wakes threads blocked on the lock flag used what was causing this? Was it the kernel or ruby or something else?Even after rebooting and setting the date manually, I still get this when stracing ruby 1.8 -f:[pid 7021] clock_gettime(CLOCK_REALTIME, {1341305908, 231893109}) = 0