Massive slowdown in mwc-random after switching to use of primitive package

[Simon Peyton-Jones]

Well, fewer dependencies make it much easier to test and reproduce.  But something concrete is certainly better than nothing.  Please submit a Trac ticket.  (Worth checking with Roman -- perhaps he already has?)

Simon

| -----Original Message-----
| From: Dan Doel [mailto:dan.doel at gmail.com]
| Sent: 12 July 2010 01:56
| To: Simon Peyton-Jones
| Cc: glasgow-haskell-users at haskell.org
| Subject: Re: Massive slowdown in mwc-random after switching to use of
| primitive package
| 
| On Sunday 11 July 2010 1:31:23 pm Simon Peyton-Jones wrote:
| > This is the first I've heard of this.  Do you have a test case that shows
| > up the problem?  Then we can put it in the regression tests so it won't go
| > wrong again.
| 
| That depends on what dependencies you're willing to accept. I think all the
| mutable algorithms in vector-algorithms are affected (I first discovered the
| problem after porting my benchmarks), so if you don't mind depending on
| vector
| and vector-algorithms, it shouldn't be hard to write one.
| 
| If something stand-alone is required, I (at least) don't have anything
| prepared at the moment.
| 
| -- Dan