Two improvements to perf.py

1. Log how many memory samples were collected. I want to improve the sampling rate going forward.
2. Give the charts dynamically-sized margins. This improves the performance timeline for float, for example: (old)  http://tinyurl.com/ybxvmck -> (new) http://tinyurl.com/ykyaeb8.

[Collin Winter, 2010-01-27 23:05:16]

PTAL

[Jeffrey Yasskin, 2010-01-27 23:17:45]

Otherwise, LGTM.

http://codereview.appspot.com/195078/diff/1/2
File perf.py (right):

http://codereview.appspot.com/195078/diff/1/2#newcode515
perf.py:515: # Add a 10% margin, top and bottom.
10% should be of the min->max range, not their absolute values.

http://codereview.appspot.com/195078/diff/1/2#newcode518
perf.py:518: if min_data < 10:  # Give a nicer Y axis.
This seems like it should be based on a comparison with max_data. Otherwise, a
graph with all samples between 9.1 and 9.5 will look like a line.

[5591boy, 2011-01-29 10:23:16]

On 2010/01/27 23:05:16, Collin Winter wrote:
> PTAL