Re: [Yaml-core] Speed comparison between vanilla pyyaml and yaml+libyaml

[Anders K. <an...@MI...>]

On Wed, 22 Apr 2009, jn...@gm... wrote:
> What bothers me is that there's a negligible difference in speed, even 
> with libyaml installed, and pyyaml using the cyaml extension:

Are you sure that pyyaml is using the cyaml extension?  You need to 
explicitly tell it to do so:

-    j = yaml.dump(raw)
-    yaml.load(j)
+    j = yaml.dump(raw, Dumper=yaml.CDumper)
+    yaml.load(j, Loader=yaml.CLoader)

After such changes, I see a ~4x speedup.

before:
ser_yaml            (6.870s) 623178 bytes
ser_yaml_compressed   (6.930s) 291042 bytes
serde_yaml          (19.660s)

after:
ser_yaml            (2.120s) 623533 bytes
ser_yaml_compressed   (2.150s) 291208 bytes
serde_yaml          (5.100s)

Anders