Ouch: Serial performance on OS X v Windows
It’s not that I own thousands of shares of apple sock or anything of the sort,
yet i’m saddened each time i find a technique/tool that works far better on windows than on OS X.
and here, one of those cases:
The same patch runs VERY differently on Windows vs. OS X. On windows, I get very good timing performance (a light bulb flashing 25ms ON/25 OFF looks pretty good), and very few packet drops (about %95 success). On OS X, I get terrible performance, about %30 of the packets get through successfully.
I’ve made sure to test with the same attributes for the Serial object for both systems.
Mac: MacBookPro 2.4GHz, 4gb RAM, 10.6.7, Max 5.1.8 (45300)
PC: Some laptop 2.2GHz, 2gb RAM, Windows Vista SP2, Max 5.1.8 (45300)
Does anyone have a hunch as to why performance is so dramatically different on the two systems?
I was doing a project with an XBee Pro sending extremely fast PWM (initially once/millisecond) to control some EL-wire, and found that it was very unreliable (it would stop working responsively after a couple of minutes) until I changed the patch to work through MSP, with a snapshot~ object outputting the final PWM value to the serial object. I’ve also found that some of the higher baud-rates can be quite unreliable when using serial outs on my mac running Max/MSP (never tried it on Windows, so I can’t compare), so maybe you could change this if possible? After making these changes I was able to send serial information once every 11 samples, with rock solid reliability for hours at a time.