Fix flakiness in pulse-optimal UnitarySynthesis test
#11307
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The previous iteration of this test asserted that the `sx` count for non-optimal synthesis was higher than a certain particular value. This value did not have any fundamental properties, it was just the value that happened to be returned for some time. Recent OpenBLAS support for x86_64 instructions from the AVX512 SkylakeX set meant that supporting processors can now return slightly fewer `sx` gates in the non-optimal path, despite the pulse-optimal synthesis still not being in use. This caused flaky CI, when we were allocated an Azure VM that had access to the new instructions.
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Nov 23, 2023
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The previous iteration of this test asserted that the `sx` count for non-optimal synthesis was higher than a certain particular value. This value did not have any fundamental properties, it was just the value that happened to be returned for some time. Recent OpenBLAS support for x86_64 instructions from the AVX512 SkylakeX set meant that supporting processors can now return slightly fewer `sx` gates in the non-optimal path, despite the pulse-optimal synthesis still not being in use. This caused flaky CI, when we were allocated an Azure VM that had access to the new instructions. (cherry picked from commit c7ecb5f)
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The previous iteration of this test asserted that the `sx` count for non-optimal synthesis was higher than a certain particular value. This value did not have any fundamental properties, it was just the value that happened to be returned for some time. Recent OpenBLAS support for x86_64 instructions from the AVX512 SkylakeX set meant that supporting processors can now return slightly fewer `sx` gates in the non-optimal path, despite the pulse-optimal synthesis still not being in use. This caused flaky CI, when we were allocated an Azure VM that had access to the new instructions. (cherry picked from commit c7ecb5f) Co-authored-by: Jake Lishman <jake.lishman@ibm.com>
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The previous iteration of this test asserted that the `sx` count for non-optimal synthesis was higher than a certain particular value. This value did not have any fundamental properties, it was just the value that happened to be returned for some time. Recent OpenBLAS support for x86_64 instructions from the AVX512 SkylakeX set meant that supporting processors can now return slightly fewer `sx` gates in the non-optimal path, despite the pulse-optimal synthesis still not being in use. This caused flaky CI, when we were allocated an Azure VM that had access to the new instructions.
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Summary
The previous iteration of this test asserted that the
sxcount for non-optimal synthesis was higher than a certain particular value. This value did not have any fundamental properties, it was just the value that happened to be returned for some time. Recent OpenBLAS support for x86_64 instructions from the AVX512 SkylakeX set meant that supporting processors can now return slightly fewersxgates in the non-optimal path, despite the pulse-optimal synthesis still not being in use. This caused flaky CI, when we were allocated an Azure VM that had access to the new instructions.Details and comments
Fix #11287.
Unblocks #11262 and lets us reinstate #11020.