Re: [VM] Weird performance issue with a VM folder

[Daniel Barrett]

On December 16, 2014, Uday Reddy wrote:
>If you still have the old version of the folder, please try profiling.

Thanks for the suggestion - I didn't even know emacs did profiling.
I've included profiles of running vm-visit-folder on "good" and "bad"
folders of about 450 messages for comparison.  I've included the lines
that most clearly differentiate the two runs.

The "good" folder was processed in 0.6 seconds:

vm-visit-folder                             1           0.66686915    0.66686915
vm                                          1           0.578879675   
0.578879675
vm-decode-mime-encoded-words                189         0.361880942   
0.0019147139
vm-update-summary-and-mode-line             4           0.3322451050  
0.0830612762
vm-summarize                                1           0.331768543   
0.331768543
vm-do-needed-summary-rebuild                2           0.331305685   
0.1656528425
vm-do-summary                               1           0.331071934   
0.331071934
vm-decode-mime-encoded-words-in-string      1387        0.311080336   
0.0002242828
vm-mime-base64-decode-region                189         0.2735256769  
0.0014472258
vm-run-command-on-region                    8           0.260684395   
0.0325855493
vm-su-summary                               453         0.206757816   
0.0004564190
vm-summary-sprintf                          4           0.206496776   
0.051624194
vm-tokenized-summary-insert                 453         0.1132789349  
0.0002500638
...
vm-find-leading-message-separator           907         0.0361465239  
3.985...e-05
vm-insert-char                              4506        0.0336452009  
7.466...e-06
...
vm-xemacs-compatible-insert-char            4506        0.0035975850  
7.983...e-07
...
vm-left-justify-string                      12          0.000122272   
1.018...e-05
...
vm-right-justify-string                     8           6.810...e-05  
8.513...e-06

The "bad" folder contained 99% of the same messages and took almost 6 seconds:

vm-visit-folder                             1           5.902866221   
5.902866221
vm                                          1           5.82534551    5.82534551
vm-summarize                                1           5.652573062   
5.652573062
vm-update-summary-and-mode-line             3           5.6430740480  
1.8810246826
vm-do-needed-summary-rebuild                1           5.642558428   
5.642558428
vm-do-summary                               1           5.642472744   
5.642472744
vm-su-summary                               449         5.5901255799  
0.0124501683
vm-summary-sprintf                          430         5.5849337159  
0.0129882179
vm-decode-mime-encoded-words-in-string      4358        5.4500003469  
0.0012505737
vm-decode-mime-encoded-words                182         5.4220282910  
0.0297913642
vm-mime-base64-decode-region                183         5.3929850379  
0.0294698635
vm-run-command-on-region                    182         5.3591683290  
0.0294459798
vm-read-folder                              1           0.092051119   
0.092051119
...
vm-find-trailing-message-separator          449         0.035558065   
7.919...e-05
vm-find-leading-message-separator           899         0.0354277910  
3.940...e-05
vm-tokenized-summary-insert                 449         0.0256965510  
5.723...e-05
vm-left-justify-string                      1290        0.0252046220  
1.953...e-05
...
vm-right-justify-string                     860         0.0067221149  
7.816...e-06
...
vm-string-width                             2150        0.0050137250  
2.331...e-06
vm-truncate-string                          860         0.0038709260  
4.501...e-06
...
vm-insert-char                              17          5.052...e-05  
2.971...e-06
...
vm-xemacs-compatible-insert-char            17          1.3549e-05    
7.970...e-07

Hope this helps!! Let me know if you want me to file a bug containing the full
output.

--
Dan Barrett
address@hidden