diff options
| author | Stefan Behnel <stefan_ml@behnel.de> | 2013-04-06 12:59:58 +0200 |
|---|---|---|
| committer | Stefan Behnel <stefan_ml@behnel.de> | 2013-04-06 12:59:58 +0200 |
| commit | b43261d2f5912fb0ef08a786c31b90f1523b54db (patch) | |
| tree | 16eb82857026afc941d7ec1294376ac339c475b9 | |
| parent | d5877565fecef05d8ef40545bdb5dc68ceb25c8f (diff) | |
| download | python-lxml-b43261d2f5912fb0ef08a786c31b90f1523b54db.tar.gz | |
update objectify performance numbers
| -rw-r--r-- | doc/performance.txt | 40 |
1 files changed, 20 insertions, 20 deletions
diff --git a/doc/performance.txt b/doc/performance.txt index 3ff7154b..d06302b3 100644 --- a/doc/performance.txt +++ b/doc/performance.txt @@ -774,21 +774,21 @@ ObjectPath can be used to speed up the access to elements that are deep in the tree. It avoids step-by-step Python element instantiations along the path, which can substantially improve the access time:: - lxe: attribute (--TR T1) 4.5464 msec/pass - lxe: attribute (--TR T2) 18.6505 msec/pass - lxe: attribute (--TR T4) 4.4115 msec/pass + lxe: attribute (--TR T1) 4.1828 msec/pass + lxe: attribute (--TR T2) 17.3802 msec/pass + lxe: attribute (--TR T4) 3.8657 msec/pass - lxe: objectpath (--TR T1) 0.9568 msec/pass + lxe: objectpath (--TR T1) 0.9289 msec/pass lxe: objectpath (--TR T2) 13.3109 msec/pass - lxe: objectpath (--TR T4) 1.0018 msec/pass + lxe: objectpath (--TR T4) 0.9289 msec/pass - lxe: attributes_deep (--TR T1) 6.4061 msec/pass - lxe: attributes_deep (--TR T2) 20.8254 msec/pass - lxe: attributes_deep (--TR T4) 6.2237 msec/pass + lxe: attributes_deep (--TR T1) 6.2900 msec/pass + lxe: attributes_deep (--TR T2) 20.4713 msec/pass + lxe: attributes_deep (--TR T4) 6.1679 msec/pass - lxe: objectpath_deep (--TR T1) 1.5173 msec/pass - lxe: objectpath_deep (--TR T2) 14.9171 msec/pass - lxe: objectpath_deep (--TR T4) 1.5221 msec/pass + lxe: objectpath_deep (--TR T1) 1.3049 msec/pass + lxe: objectpath_deep (--TR T2) 14.0815 msec/pass + lxe: objectpath_deep (--TR T4) 1.3051 msec/pass Note, however, that parsing ObjectPath expressions is not for free either, so this is most effective for frequently accessing the same element. @@ -818,17 +818,17 @@ expressions to be more selective. By choosing the right trees (or even subtrees and elements) to cache, you can trade memory usage against access speed:: - lxe: attribute_cached (--TR T1) 3.8185 msec/pass - lxe: attribute_cached (--TR T2) 17.1666 msec/pass - lxe: attribute_cached (--TR T4) 3.6592 msec/pass + lxe: attribute_cached (--TR T1) 3.1357 msec/pass + lxe: attribute_cached (--TR T2) 15.8911 msec/pass + lxe: attribute_cached (--TR T4) 2.9194 msec/pass - lxe: attributes_deep_cached (--TR T1) 4.3907 msec/pass - lxe: attributes_deep_cached (--TR T2) 18.0719 msec/pass - lxe: attributes_deep_cached (--TR T4) 4.3812 msec/pass + lxe: attributes_deep_cached (--TR T1) 3.8984 msec/pass + lxe: attributes_deep_cached (--TR T2) 16.8300 msec/pass + lxe: attributes_deep_cached (--TR T4) 3.6936 msec/pass - lxe: objectpath_deep_cached (--TR T1) 0.7939 msec/pass - lxe: objectpath_deep_cached (--TR T2) 13.5620 msec/pass - lxe: objectpath_deep_cached (--TR T4) 0.8042 msec/pass + lxe: objectpath_deep_cached (--TR T1) 0.7496 msec/pass + lxe: objectpath_deep_cached (--TR T2) 12.3763 msec/pass + lxe: objectpath_deep_cached (--TR T4) 0.7427 msec/pass Things to note: you cannot currently use ``weakref.WeakKeyDictionary`` objects for this as lxml's element objects do not support weak references (which are |