121–130 of 180 posts
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Did you somehow accumulate a bajillion passwords?
Crypto optimizations are no joke. My Pinebook Pro takes several seconds longer than my T430 to decrypt my keepassxc database.
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It's a shame we can't see the rest of the code. What is happening to the result value? Is it being compared to something? Put into an array, or what? All of that code probably totally outweighs what you pointed out here. Or, at least it should. I have a bad feeling it might be being dead-code eliminated, since compilers are super aggressive about that nowadays, but I hope he's somehow controlled for that.
The blog post links to the benchmark... It's repeatedly populating a 20k entry array with the results. godbolt clang compiles it to: .LBB5_2: // =>This Inner Loop Header: Depth=1 mul x13, x11, x10 umulh x14, x11, x10 eor x13, x14, x13 mul x14, x13, x12 umulh x13, x13, x12 eor x13, x13, x14 str x13, [x0, x8, lsl #3] add x8, x8, #2 // =2 cmp x8, x1 add x11, x11, x9 b.lo .LBB5_2 [1] https://github.com/lemire/Code-used-o…
The benchmark probably get rids of that by doing it 40,000 times in quick succession, but why not measure the time of all 40,000 iterations in one go, and decrease the risk (and the overhead of calling gettimeofday 39,999 times)?
That's great if you App is compute bound. "May all your Processes be compute bound." Back in the real world most of the time your Process will be io bound. I think that's the real innovation of the M1 chip.
Explain please. What does the M1 do to IO loads?
Did anyone actually look at the machine code generated here? 0.30ns per value? That is basically 1 cycle. Of course, there is no way that a processor can compute so many dependent instructions in one cycle, simply because they generate so many dependent micro-ops, and every micro-op is at least one cycle to go through an execution unit. So this must mean that either the compiler is unrolling the (benchmarking) loop,…
for (size_t i = 0; i This is also visible in the assembly
add x8, x8, #2
[1] https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/...
I love my M1, but does anyone else have horrific performance when resuming from wake? It’s like it swaps everything to disk and takes a full minute to come back to life.
I have a non-M1 with Big Sir and it takes more than full minute from sleep to usable. I suspect it’s because I have five monitors and 20 million pixels (actually more as that’s the post-retina resolution).
Rendering a FPS game at 1080p is 2 million pixels per frame. At 60fps, that's rendering 120 million pixels per second.
What am I missing?
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Explain please. What does the M1 do to IO loads?
Nothing. Compute speed isn't that important if you're waiting on IO is GP's point.
Anyone want to take a guess at how long it will be until Apple has their own fab in the US making M1 chips?
With Apple holding a lot of cash offshore awaiting for a favourable way to onshore it, combined with the political eagerness to bring chip production onshore. Those two aspect may well pan out to a situation in which the accountants see it as a win win. Even then, do Apple use enough chips to justify running a fab, let alone one that would be locked into the node of the time. I really don't see it happening for many…
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For me it's maybe 5-10 seconds for it to wake my Thunderbolt monitor (LG 4K) from "cold". It's much faster if the monitor has been used recently, though, so I always figured it was the monitor that was causing the delay by going into some deep sleep state?
Same monitor. The workaround is to put the monitor on a power strip you can trigger when you walk up to it. Hard power off/on of this monitor and it instantly displays for me now.
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For me it's maybe 5-10 seconds for it to wake my Thunderbolt monitor (LG 4K) from "cold". It's much faster if the monitor has been used recently, though, so I always figured it was the monitor that was causing the delay by going into some deep sleep state?
Do you have issues with the sound on your LG monitor? I have an LG too and the sound being transmitted by the M1 is very bad.
It's just "cheap speakers" bad, though, not anything that would suggest an issue with the sound output from the M1. I've used the LG with a few different Macs, and sound quality is the same from any of them.