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-devel@googlegroups.com>
Reply-To: <mpir-devel@googlegroups.com>
Date: Tuesday, January 15, 2019 at 2:16 AM
To: mpir-devel <mpir-devel@googlegroups.com>
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> 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-devel@googlegroups.com>
Reply-To: <mpir-devel@googlegroups.com>
Date: Monday, January 14, 2019 at 8:11 PM
To: mpir-devel <mpir-devel@googlegroups.com>
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? Paging?

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