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2014-11-07T10:18:11Z stassats: so, it takes 12 minutes to build on POWER8, compared to 3 on the latest intel
2014-11-07T10:18:29Z stassats: not sure what it tells, maybe that SBCL isn't that well optimized for ppc
2014-11-07T10:20:39Z stassats: and this is weird, power7 is 10 minutes
2014-11-07T10:21:23Z ams: some caching differences?
2014-11-07T10:21:46Z stassats: 100 MHz difference, but i would expect new arch to account for that
2014-11-07T10:22:04Z stassats: maybe they are just optimized for a lot of threads instead
2014-11-07T10:22:46Z ams: i usually blame it on disks .. but uhm, yeah ..
2014-11-07T10:26:26Z stassats: something silly, like computing a factorial: 5 seconds on power8, 2.5 seconds on power7
2014-11-07T10:26:39Z stassats: maybe power8 is just bad with 32-bit code?
2014-11-07T10:27:06Z ams: modify the code to use 64 bit numbers, and see what happens?
2014-11-07T10:27:20Z stassats: "a year later"
2014-11-07T10:27:58Z ams: .. shouldn't be to hard ..
2014-11-07T10:28:22Z ams: can't you take the compiled functiuon, modify it to use 64 bit regs, and insns, and load that, and .. :-)
2014-11-07T10:28:41Z ams: or even write it manually ..
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2014-11-07T14:03:32Z pkhuong: stassats: single threaded? do we conditionalise out the barriers in allocation routines?
2014-11-07T14:05:10Z stassats: i think it has something to do with dynamic SMT partition, it can be configured to throw more resources on a single thread
2014-11-07T14:05:16Z stassats: or partition them across 8 threads
2014-11-07T14:06:48Z pkhuong: that sounds likely
2014-11-07T14:07:12Z stassats: and i don't think i can control that bit
2014-11-07T14:10:13Z stassats: but i guess threaded benchmarks would be interesting
2014-11-07T14:10:21Z stassats: scaling to 160 threads...
2014-11-07T14:15:01Z stassats: haven't tried running tests yet, but i don't think we used that much threads for tests
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2014-11-07T15:18:35Z pkhuong: and we don't need 160 threads to tell us we have tons of races on PPC (:
2014-11-07T15:25:43Z stassats: eeh, i'd love to port to ppc64, but not enough time
2014-11-07T15:25:52Z stassats: and i guess an arm64 port is more important
2014-11-07T15:26:22Z stassats waits for nexus 9 to become available
2014-11-07T15:26:36Z stassats: and then for a 64-bit linux chroot
2014-11-07T15:30:19Z Krystof: I got an arm64 qemu thing booting a couple of months ago
2014-11-07T15:32:23Z stassats: i prefer real hardware
2014-11-07T15:32:39Z stassats: besides, nexus 9 sounds like a nice upgrade for my old nexus 7
2014-11-07T15:37:30Z Krystof: it is 2 bigger
2014-11-07T15:37:48Z foom: And everyone knows, bigger = better, right?
2014-11-07T15:38:32Z stassats: and 64 is larger than 32 as well
2014-11-07T15:38:47Z foom: Apple has been on an ad blitz lately telling everyone that giant phones are the best thing ever. I wonder what the upper limit for phone size really is. :)
2014-11-07T15:39:10Z foom: I thought 5" was surely the biggest they could go.
2014-11-07T15:41:01Z stassats: 7" seems to be the limit
2014-11-07T15:43:26Z foom: We'll see next year. They've been growing bigger every year, so far.
2014-11-07T15:44:19Z pkhuong: smaller tablets are simultaneously The Thing
2014-11-07T15:44:39Z pkhuong: I'm more interested in the cross-over point when phones will be as big as tablets myself ;)
2014-11-07T15:45:26Z Krystof <- still smartphone- and tablet-free
2014-11-07T15:45:55Z stassats: luddite!
2014-11-07T15:52:35Z loke_: Krystof: Why?
2014-11-07T15:53:19Z Krystof: because I find the level of intrusion that they entail vastly outweighs the value I perceive they bring
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2014-11-07T21:20:18Z stassats: so many compiler bugs
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