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CUDA-x86.

explain output
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Alexey A. Romanenko



Joined: 17 Feb 2012
Posts: 31
PostPosted: Fri Feb 01, 2013 1:30 am    Post subject: explain output Reply with quote
Hi all!

could you please explain what those two lines mean:
Quote:
Generating present_or_copyin(r_g$ac(:))
Generating present_or_copyin(r_r$ac(m))

In particular I'm interesting in parts "$ac(:)" and "$ac(m)".

I have r_r and r_g vars declared as
Quote:
REAL, DIMENSION(ntb_r), PARAMETER, PRIVATE:: &
r_r = (/1.e-6,2.e-6,3.e-6,4.e-6,5.e-6,6.e-6,7.e-6,8.e-6,9.e-6, &
...

REAL, DIMENSION(ntb_g), PARAMETER, PRIVATE:: &
r_g = (/1.e-5,2.e-5,3.e-5,4.e-5,5.e-5,6.e-5,7.e-5,8.e-5,9.e-5, &
...


Inside the loop I read an appropriate constants "r_g(i)".
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mkcolg



Joined: 30 Jun 2004
Posts: 4996
Location: The Portland Group Inc.
PostPosted: Fri Feb 01, 2013 5:48 pm    Post subject: Reply with quote
Hi Alexey,

This happens when the program has initialized data, such as this array parameter. To do this, the compiler creates and initializes a local array to the device.

- Mat
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Alexey A. Romanenko



Joined: 17 Feb 2012
Posts: 31
PostPosted: Mon Feb 04, 2013 12:21 am    Post subject: Reply with quote
Hi Mat!

Thank you.

Do you have any plans to put this data in constant memory instead of local?

Alexey
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mkcolg



Joined: 30 Jun 2004
Posts: 4996
Location: The Portland Group Inc.
PostPosted: Mon Feb 04, 2013 10:41 am    Post subject: Reply with quote
Quote:
Do you have any plans to put this data in constant memory instead of local?
Not yet, but we'll look into it. The problem is that constant memory is only 64k, so we'd need to have a whole program view of the total amount of data put into constant memory.

- Mat
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Alexey A. Romanenko



Joined: 17 Feb 2012
Posts: 31
PostPosted: Tue Feb 19, 2013 12:32 am    Post subject: Reply with quote
Hi Mat!

Is it true PGI copy data to GPU from FORTRAN DATA section each time at kernel launch? This behavior seems very strange. For example,

Code:
2163 !$acc data copyin(vr,vg,Dr,Dg,crg,cre,cgg,cge,dtr,dtg,N0r_exp,N0g_exp,r_r,r_g) &
2164 !$acc copyout(tcg_racg,tmr_racg,tcr_gacr,tmg_gacr,tnr_racg, &
2165 !$acc tnr_gacr) create(N_r)
2166       do km = km_s, km_e
2167          m = km / ntb_r1 + 1
2168          k = mod( km , ntb_r1 ) + 1
2169          lam_exp = (N0r_exp(k)*am_r*crg(1)/r_r(m))**ore1
2170          lamr = lam_exp * (crg(3)*org2*org1)**obmr
2171          N0_r = N0r_exp(k)/(crg(2)*lam_exp) * lamr**cre(2)
2172 !$acc kernels
2173          do n2 = 1, nbr
2174             N_r(n2) = N0_r*Dr(n2)**mu_r *DEXP(-lamr*Dr(n2))*dtr(n2)
2175          enddo

PGI reports
Code:
   2163, Generating create(n_r(:))
         Generating copyout(tnr_gacr(:,:,:,:))
         Generating copyout(tnr_racg(:,:,:,:))
         Generating copyout(tmg_gacr(:,:,:,:))
         Generating copyout(tcr_gacr(:,:,:,:))
         Generating copyout(tmr_racg(:,:,:,:))
         Generating copyout(tcg_racg(:,:,:,:))
         Generating copyin(dtg(:))
         Generating copyin(dtr(:))
         Generating copyin(cge(:))
         Generating copyin(cgg(:))
         Generating copyin(cre(:))
         Generating copyin(crg(:))
         Generating copyin(dg(:))
         Generating copyin(dr(:))
         Generating copyin(vg(:))
         Generating copyin(vr(:))
   2172, Generating present_or_copyin(dg(:))
         Generating present_or_copyin(dtg(:))
         Generating present_or_copyin(cgg(:))
         Generating present_or_copyin(n0g_exp$ac(:))
         Generating present_or_copyin(r_g$ac(:))
         Generating present_or_copyin(cge(:))
         Generating present_or_copyin(vr(:))
         Generating present_or_copyin(vg(:))
         Generating present_or_copyout(tcg_racg(:,:,:,:))
         Generating present_or_copyin(r_r$ac(m))
         Generating present_or_copyout(tmr_racg(:,:,:,:))
         Generating present_or_copyout(tcr_gacr(:,:,:,:))
         Generating present_or_copyout(tmg_gacr(:,:,:,:))
         Generating present_or_copyout(tnr_racg(:,:,:,:))
         Generating present_or_copyout(tnr_gacr(:,:,:,:))
         Generating present_or_create(n_r(:))
         Generating present_or_copyin(dtr(:))
         Generating present_or_copyin(dr(:))

there is no copyin record for r_r, r_g, n0g_exp vars on line 2163. As the result I have three memory transfer operations before kernel launch.

Code:
        2163: data copyin reached 10 times
             device time(us): total=51 max=6 min=5 avg=5
        2172: data copyin reached 4107 times
             device time(us): total=23,710 max=60 min=4 avg=5
        2173: kernel launched 1369 times

Any idea?

Thanks.
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