Re: RandomAccessFile and the native futex

The behavior is the same with the IBM JVM. I was running Java 6. How do I get around this problem? How can I make sure I am using the correct glibc libraries? I can't seem to find any information as to what the recommended version is for JVM to run.

Thanks
A

> Date: Tue, 18 Dec 2007 19:52:21 -0500
> From: [email protected]
> Subject: Re: [ADVANCED-JAVA] RandomAccessFile and the native futex
> To: [email protected]
> 
> Can you try your benchmark with the IBM JVM?
> On Dec 18, 2007, at 11:41 AM, Avinash Lakshman wrote:
> 
> > It looks like this may have something to do with incompatibility  
> > between NPTL threads and Java threads on Fedora Core 4. Anyone run  
> > into this problem before? I am using JDK6 with FC4   
> > 2.6.12-1.1398_FC4smp.
> >
> > A
> >
> >> Date: Mon, 17 Dec 2007 19:03:42 -0600
> >> From: [email protected]
> >> Subject: [ADVANCED-JAVA] RandomAccessFile and the native futex
> >> To: [email protected]
> >>
> >> Hi All
> >>
> >> I see 52 ms being spent in calls to readFully() method of the  
> >> RandomAccessFile. I ran strace against my process and figured that  
> >> these weren't reads going to disk. All reads were being served from  
> >> the buffer cache (verified by running iostat). It also looks like  
> >> the 52 ms is a futex timeout but strace doesn't report which system  
> >> call causes this. I was wondering if anyone has seen this problem  
> >> before and how do I go about addressing this? Do I have access to  
> >> the source code of the native library used by RandomAccessFile?  
> >> Here is the output from strace (the offending line is in bold):
> >>
> >>
> >> 29673 16:36:47.747658
> >> futex(0x2aac3f62a674, FUTEX_WAIT, 1, {0, 49972000} <unfinished
> >> ...>
> >> 29716 16:36:47.784379 <... futex
> >> resumed> ) = -1 ETIMEDOUT (Connection timed out)
> >> <0.044427>
> >> 29716 16:36:47.784469
> >> futex(0x2aac3f66e328, FUTEX_WAKE, 1) = 0
> >> <0.000012>
> >> 29716 16:36:47.784548
> >> clock_gettime(CLOCK_REALTIME, {1197938207, 784565000}) = 0
> >> <0.000012>
> >> 29716 16:36:47.784610
> >> futex(0x2aac3f670314, FUTEX_WAIT, 1, {0, 19970000} <unfinished
> >> ...>
> >> 29673 16:36:47.799354 <... futex
> >> resumed> ) = -1 ETIMEDOUT (Connection timed out)
> >> <0.051676>
> >> 29673 16:36:47.799392
> >> futex(0x2aac3f2a7228, FUTEX_WAKE, 1) = 0
> >> <0.000011>
> >> 29673 16:36:47.799434
> >> clock_gettime(CLOCK_MONOTONIC, {6497274, 522227024}) = 0
> >> <0.000007>
> >> 29673 16:36:47.799481
> >> clock_gettime(CLOCK_MONOTONIC, {6497274, 522275024}) = 0
> >> <0.000007>
> >>
> >> Thanks
> >> Avinash
> >>
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