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by AHTERIX5000 2927 days ago
Wonder why, because of poor SMP scalability and coarse locking?

I've encountered some cases where SMT made performance worse such as with very optimized HPC libs but in general SMT can really help. Compiling projects got a nice boost when enabling HT on Intel's recent arch for example (all of this on Linux though, last time I checked OpenBSD its SMP perf was abysmal)
1 comments
Uberphallus 2927 days ago
For I/O and memory bound processes, it makes it worse, saturating further buses that are already saturated. For regular. For CPU bound, it may help or not, depending on many factors, like cache/memory contention, nature of the operations...

Compilation can get boosts because while some threads are waiting for I/O others are crunching source files. Also the variety of computation is high enough so multiple threads don't overlap too much on functional unit usage. If you try to build from a filesystem in memory, you'll find way a less impressive speedup (if any).

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AHTERIX5000 2927 days ago
Yeah I've spent my time looking at perf counters and I'm aware how cache access patterns affect. But the statement was drastic enough to make me suspect there is something more OpenBSD specific going on.
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