Re: [Gems-users] ATMTP: Problem with strange Transaction-Aborts

[Jayaram Bobba <bobba@xxxxxxxxxxx>]

I think it would be useful to get more debugging output from the simulator.
Please turn on XACT_DEBUG and set XACT_DEBUG_LEVEL to 2 or 3.
PROFILE_EXCEPTIONS should let you know if a TLB-miss is happening in your
simulation.
http://www.cs.wisc.edu/gems/doc/gems-wiki/moin.cgi/Transactional_Memory

I wouldn't worry too much about the zeros, since with ATMTP, the appropriate
values are not send to the profiler method (profileAbortTransaction() at
TransactionInterfaceManager.C). Having said that, it would be good to modify
the code to fix this issue and get more information about the exact PC where
your abort is happening.


Philipp Tölke wrote:
> Hi Everyone,
>
>   
> > > Did your compiled benchmark have TLB warm up or TLB miss handling?
> > >       
> > I don't think so.
> >     
> I do now :-)
>
> [cpu0] v:0x00000000000134f4 p:0x000301774f4  chkpt 0x13504
> [cpu0] v:0x00000000000134f8 p:0x000301774f8  nop
> [cpu0] v:0x00000000000134fc p:0x000301774fc  ba 0x13508
> [cpu0] v:0x0000000000013500 p:0x00030177500  mov 1, %o0
> [cpu0] v:0x0000000000013508 p:0x00030177508  mov %o0, %l0
> [cpu0] v:0x000000000001350c p:0x0003017750c  stw %l0, [%fp + -4]
> [cpu0] v:0x0000000000013510 p:0x00030177510  mov %l0, %i0
> [cpu0] v:0x0000000000013514 p:0x00030177514  jmpl [%i7 + 8], %g0
> [cpu0] v:0x0000000000013518 p:0x00030177518  restore %g0, %g0, %g0
> [cpu0] v:0x0000000000025b88 p:0x00036c65b88  ldd [%sp + 160], %f62
> [cpu0] v:0x0000000000025b8c p:0x00036c65b8c  orcc %g0, %o0, %g0
> [cpu0] v:0x0000000000025b90 p:0x00036c65b90  ldd [%sp + 168], %f0
> [cpu0] v:0x0000000000025b94 p:0x00036c65b94  ldd [%sp + 224], %f32
> [cpu0] v:0x0000000000025b98 p:0x00036c65b98  ldd [%sp + 216], %f22
> [cpu0] v:0x0000000000025b9c p:0x00036c65b9c  ldd [%sp + 232], %f58
> [cpu0] v:0x0000000000025ba0 p:0x00036c65ba0  ldd [%sp + 200], %f28
> [cpu0] v:0x0000000000025ba4 p:0x00036c65ba4  ldd [%sp + 176], %f48
> [cpu0] v:0x0000000000025ba8 p:0x00036c65ba8  ldd [%sp + 184], %f36
> [cpu0] v:0x0000000000025bac p:0x00036c65bac  ldd [%sp + 192], %f26
> [cpu0] v:0x0000000000025bb0 p:0x00036c65bb0  ldd [%sp + 208], %f50
> [cpu0] v:0x0000000000025bb4 p:0x00036c65bb4  bne,pn %icc, 0x25c28
> [cpu0] v:0x0000000000025bb8 p:0x00036c65bb8  lduw [%l2 + 0], %l1
> [cpu0] v:0x0000000000025c28 p:0x00036c65c28  ldd [%i1 + 176], %f60
> [cpu0] v:0x0000000001001660 p:0x00007401660  retry
> 6826445428   0 [0,0] TID -1 XACT ABORT 0 caused by 0 [ 0, 0 ] xid: 0
> address: [0x0, line 0x0] delay: 6826445428  PC [0x0, line 0x0]  *PC 0x0
> 'illtrap 0'
>
>   
> > I am concerned about two points:
> > - in the above error-message, there are only zeros.
> >     
> This still holds.
>
>   
> > - after this message, the simulation hangs. ^C^C cancels the simulation,
> >   but not in a recoverable way
> >     
> This still holds.
>
> Is this consistent with a TLB-Miss? Why does the simulation fail after
> this?
>
> Thank you!
>
> Regards,
>   
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