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Valgrind: Difference between revisions
→AVX-512 Limitations
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== AVX-512 Limitations == | == AVX-512 Limitations == | ||
Note that current versions of Valgrind are unable to handle the [https://en.wikipedia.org/wiki/AVX-512 AVX-512] instructions used on the latest Intel processors, producing an error message like the following, | Note that current versions of Valgrind are unable to handle the [https://en.wikipedia.org/wiki/AVX-512 AVX-512] instructions used on the latest Intel processors, producing an error message like the following, | ||
</translate> | |||
<source> | <source> | ||
vex amd64->IR: unhandled instruction bytes: 0x62 0xF1 0xFE 0x8 0x6F 0x8B 0xE8 0xFF 0xFF 0xFF | vex amd64->IR: unhandled instruction bytes: 0x62 0xF1 0xFE 0x8 0x6F 0x8B 0xE8 0xFF 0xFF 0xFF | ||
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... | ... | ||
</source> | </source> | ||
<translate> | |||
Note that on [[Béluga]], the default environment uses these AVX-512 instructions. You can circumvent this problem by | Note that on [[Béluga]], the default environment uses these AVX-512 instructions. You can circumvent this problem by | ||
first loading the AVX-2 environment, | first loading the AVX-2 environment, | ||
{{Command|module load arch/avx2}} | {{Command|module load arch/avx2}} | ||
and then recompiling your application from scratch to ensure the binary doesn't contain any such instructions. | and then recompiling your application from scratch to ensure the binary doesn't contain any such instructions. | ||
== Preparing your application == <!--T:3--> | == Preparing your application == <!--T:3--> | ||
To get useful information from [http://valgrind.org/ Valgrind], you first need to compile your code with debugging information enabled. With the most compilers, you do so by adding a "<tt>-g</tt>" option during compilation. | To get useful information from [http://valgrind.org/ Valgrind], you first need to compile your code with debugging information enabled. With the most compilers, you do so by adding a "<tt>-g</tt>" option during compilation. | ||