Did anyone figure this out? I'm giving my class their assignment to use MPIR. Many of the students use Mac laptops. http://www.cs.sjsu.edu/~mak/CS144/assignments/6/Assignment6.pdf
On Tuesday, January 15, 2019 at 11:40:46 AM UTC-8, Dima Pasechnik wrote: > > Perhaps we can put up this code on MPIR's Travis CI and see how it > goes on OSX available there. > > Dima > > On Tue, Jan 15, 2019 at 7:30 PM 'Bill Hart' via mpir-devel > <mpir-...@googlegroups.com <javascript:>> wrote: > > > > One difference is in how jump tables are implemented. But I really don't > see how that would be related to this issue. > > > > Are you sure you are not just running out of memory under OSX? Or > perhaps OSX is just pushing stuff out to disk earlier than Linux? > > > > Bill. > > > > On Tue, 15 Jan 2019 at 20:07, Ronald Mak/SJSU <ron...@sjsu.edu > <javascript:>> wrote: > >> > >> Hi, Bill. > >> > >> > >> > >> This will take some detective work to see what are the differences, if > any, between how MPIR is built on macOS and Linux. It could be a > configuration issue. Maybe I’ll get a student to look into this. > >> > >> > >> > >> – Ron > >> http://www.cs.sjsu.edu/~mak/ > >> > >> > >> > >> “On two occasions I have been asked, 'Pray, Mr. Babbage, if you put > into the machine wrong figures, will the right answers come out?' I am not > able rightly to apprehend the kind of confusion of ideas that could provoke > such a question.” > >> -- Charles Babbage, 1791-1871, world’s first computer scientist > >> > >> > >> > >> > >> > >> From: 'Bill Hart' via mpir-devel <mpir-...@googlegroups.com > <javascript:>> > >> Reply-To: <mpir-...@googlegroups.com <javascript:>> > >> Date: Tuesday, January 15, 2019 at 2:16 AM > >> To: mpir-devel <mpir-...@googlegroups.com <javascript:>> > >> Subject: Re: [mpir-devel] Re: MPIR slow on macOS? > >> > >> > >> > >> That looks correct. > >> > >> > >> > >> So your idea that it might be swapping sounds pretty likely. > >> > >> > >> > >> I did find someone else reporting a slowdown the other day, and it > turned out their program was linked to a very old GMP instead of the MPIR > they built. > >> > >> > >> > >> I'm not a Mac expert, so I don't know how to check this, but I imagine > you can find out online somewhere. > >> > >> > >> > >> Otherwise, I can't think of anything which would cause this to happen. > >> > >> > >> > >> Bill. > >> > >> > >> > >> > >> > >> On Tue, 15 Jan 2019 at 05:19, Ronald Mak/SJSU <ron...@sjsu.edu > <javascript:>> wrote: > >> > >> Hi, Bill. > >> > >> > >> > >> On my Mac laptop: > >> > >> > >> > >> ~/mpir-3.0.0: ./config.guess > >> > >> ivybridge-apple-darwin18.2.0 > >> > >> This is accurate, as far as I can tell. > >> > >> I’ve attached my pi program, which I assign to my C++ classes to give > my students practice downloading, configuring, building, and deploying a > software library. > >> > >> > >> > >> – Ron > >> http://www.cs.sjsu.edu/~mak/ > >> > >> > >> > >> > >> > >> From: 'Bill Hart' via mpir-devel <mpir-...@googlegroups.com > <javascript:>> > >> Reply-To: <mpir-...@googlegroups.com <javascript:>> > >> Date: Monday, January 14, 2019 at 8:11 PM > >> To: mpir-devel <mpir-...@googlegroups.com <javascript:>> > >> Subject: [mpir-devel] Re: MPIR slow on macOS? > >> > >> > >> > >> What does ./config.guess say your machine is? It's probably just too > new to be detected correctly. > >> > >> > >> > >> Bill. > >> > >> On Tuesday, 15 January 2019 05:05:06 UTC+1, Ronald Mak wrote: > >> > >> I wrote a C++ program that uses MPIR 3.0.0 to compute the first million > digits of pi. On a native Linux laptop with a Core i7 1.8 GHz CPU, my pi > program executed in under 8 seconds. > >> > >> I installed MPIR 3.0.0 on my MacBook Pro laptop with a Core i7 2.3 GHz > CPU and macOS Mojave 10.14.2. The same pi program took over 135 seconds to > execute. > >> > >> Then I used VirtualBox to install Ubuntu 18.10 in a virtual machine on > my MacBook Pro laptop. I installed MPIR 3.0.0 on the Ubuntu VM, and the > same pi program ran in about 7 seconds. > >> > >> What is going on with MPIR on macOS to cause my pi program to run so > much more slowly? It's apparently not a hardware issue, since the latter > two runs of my pi program were on the same laptop, but on different > operating systems. Does MPIR cause macOS to generate interrupts? Interpret > certain instructions? 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