Re: [MLton-user] MLton on mswin7 absurdly slow ?
"Wesley W. Terpstra" <[email protected]>
| Newsgroups | gmane.comp.lang.ml.mlton.devel |
|---|---|
| Message-ID | <[email protected]> |
On Mon, Feb 7, 2011 at 3:59 AM, John B Thiel <[email protected]> wrote: > on a 1.66GHz/1GB ram/mswin7 notebook (well loaded, 12+ apps open) This sounds like the root of the problem. With 1GB of physical RAM, MLton decides to use up to 512MB of it. Given you have 12+ apps open, it seems quite likely that the other apps have a combined working set + pinned pages exceeding the 512MB. Hence the thrashing. The policy of "half of physical RAM" is just a rule of thumb. The more heavily loaded your machine (as a percentage of physical RAM) the less appropriate it becomes. It seems there is some runaway allocation with the default options on > Windows, that unnecessarily overdrives into swap/thrashing. > I don't think it's runaway allocation. If I recall correctly, MLton will use copying collection with a heap size of twice the live set up until this would exceed the 50% mark. Since we've established that your hello-world program needs ~100MB, MLton will allocate 400MB. That leaves 600MB for everything else during a garbage collection. I believe Windows 7 takes somewhere in the ballpark of 200-300MB on its own, so that leaves just 300MB for your 12+ applications. So, my suggestions: 1. buy another 1GB of memory which should solve your problem outright (MLton will leave 1GB to the other 12+ apps, which must be enough since you have that much memory at the moment) 2. close all the applications you can while working on your MLton-compiled projects Keep in mind that for larger projects 100MB will not be enough to compile them. _______________________________________________ MLton mailing list [email protected] http://mlton.org/mailman/listinfo/mlton