Thursday, March 19, 2009

Peak issue rate is 18.64 Gig instrs/sec

This plot confirms the number for the peak instruction issue rate that I presented yesterday. On the T2 at 1165Mhz we get 18.64 Gig instructions/sec.

The test program spawns 64 threads that execute the following loop 10^8 times.

add %o0, %o1, %o2
add %o1, %o2, %o3
add %o3, %o4, %o5
add %o5, %o6, %o7

sub %l3, 1, %l3
subx %l2, 0, %l2

cmp %g0, %l3
bne here

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