nixlbench: allocate page aligned memory by default

[ovidiusm]

What?

Nixlbench should allocate page aligned memory for best performance in tests involving DRAM.

Why?

• Transfers from unaligned memory may be slower. Applications should use aligned memory wherever possible for best performance.
• Easier comparison with ucx_perftest and similar

[github-actions]

👋 Hi ovidiusm! Thank you for contributing to ai-dynamo/nixl.

Your PR reviewers will review your contribution then trigger the CI to test your changes.

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[ovidiusm]

/build

[brminich]

should xferBenchUtils::checkConsistency be also updated?

[ovidiusm]

should xferBenchUtils::checkConsistency be also updated?

I do not think so, it is outside the time measurements

[ovidiusm]

/build

[ovidiusm]

/build

[ovidiusm]

/build

[brminich]

/build

[brminich]

should xferBenchUtils::checkConsistency be also updated?

I do not think so, it is outside the time measurements

let me rephrase - why do we need different allocation methods in that method?