Re: weird data corruption

Hey, it looks like the output of two threads is being interleaved one
character at a time. Is that really the most efficient way to schedule
threads? Anyway, so I guess I need to set stdout and stderr to be line
buffered? Perhaps that should be the default setting? ...

----------------------------------------------------------------
2006-08-22 22:49:58 4: querying (select cmdid from pfcq_study_cmdid where 
user=2;)
2006-08-22 22:49:58 4:   duration: 0.5 msec
2006-08-22 22:49:58 4: executing (up2d0a0t6e- 0p8f-c2q2_ s2t2u:d4y9_:c5m8d i3d: 
 sueste rc m=d i2d,  
=c ocmmmdaindd+ 1=  wrheegries tuesre-rp=a2g;e)-
vi2e0w0
6-20080-62-20 82-22:24 92:25:84 94::5 8   3d:u reaxteicount:i n0g. 3( smtsaerct
 t2r0a0n6s-a0c8t-i2o2n )2
2:24090:65-80 84-:2 2e x2e2c:u4t9i:n5g8  (3c:o m m idtu)r
ation: 5.9e-2 msec
2006-08-22 22:49:58 3: querying (select cmdid from pfcq_study_cmdid where 
user=2;)
2006-08-22 22:49:58 3:   duration: 0.3 msec
2006-08-22 22:49:58 3: executing (update pfcq_study_cmdid set cmdid = cmdid+1 
where user=2;)
----------------------------------------------------------------

Frederik

On Tue, Aug 22, 2006 at 02:43:36PM +0100, Frederik Eaton wrote:
> I can't repeat it, but I can let you know if it happens again. I'm
> writing with 'hPutStr', but not directly - rather via some modules in
> a package I wrote. Kernel is Linux 2.6.16, libc 2.3.6, running Debian.
> 
> Frederik
> 
> On Tue, Aug 22, 2006 at 10:14:19AM +0100, Simon Marlow wrote:
> > Can you repeat it?  What API are you using to write the file?  On what OS?
> > 
> > Cheers,
> >     Simon
> > 
> > Frederik Eaton wrote:
> > >Sorry, forgot to say that I was using GHC 6.4.2 the first time, and
> > >ghc-6.4.3.20060816 this time.
> > >Frederik
> > >On Mon, Aug 21, 2006 at 10:45:40PM +0100, Frederik Eaton wrote:
> > >>Hi,
> > >>
> > >>I'm seeing some odd data corruption in a log file. Below, the second
> > >>line should be a SQL query (prefixed by a timestamp). It's turned into
> > >>garbage, but apparently not just random bytes. I'm using HSQL - that's
> > >>the only external library, and it uses FFI, so there might be some bad
> > >>memory management, but I thought I should ask if other people have
> > >>seen something similar. It's the second time this has happened to me.
> > >>
> > >>----------------------------------------------------------------
> > >># fillUpQueue
> > >>8-22010 62-20:83-12:12 62:2 :e3x1e:c2u6t:i nqgu e(rdyeilnegt e( sferloemc 
> > >>tp fccoqu_nstt(u*d)y 
> > >>_fqruoemu ep fwchqe_rset usdqy__uqsueeru e=  w2h)e
> > >>re sq_user = 2)
> > >>2006-08-21 22:31:27:   duration: 843.8 msec
> > >># addToQueue
> > >># getNewCards
> > >># getVT
> > >>2006-08-21 22:31:27: querying (select max(res_num) from 
> > >>pfcq_study_results where res_user = 2)
> > >>2006-08-21 22:31:27:   duration: 152.6 msec
> > >>----------------------------------------------------------------
> > >>
> > >>Regards,
> > >>
> > >>Frederik
> > >>
> > >>-- 
> > >>http://ofb.net/~frederik/
> > >>
> > 
> 
> -- 
> http://ofb.net/~frederik/
> 

-- 
http://ofb.net/~frederik/