Memory usage in range() function

[alfred42]

After I use range(1,10000001), the memory usage of IronPython will be very huge.(Up to 3GB)
Is it a bug?

[jdhardy]

range() does have to keep all of the values in memory, so using a lot of RAM is expected. 3 GB is a bit high, however. I just did a quick test on my Mac and IronPython (using 32-bit Mono) was 227 MB, compared to 315 MB for 64-bit CPython. PyPy, by comparison, used only 32 MB.

You can probably avoid the memory issue by using xrange() instead, but I'm curious if there's more to your application that causes it to use so much RAM.

[alfred42]

Thanks a lot!