| Commit message (Collapse) | Author | Age | Files | Lines |
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Comment out more code that existed solely for IE10 and older. This
prevents breaking the "Break on exceptions" functionality of the
Chromium developer tools for no gain.
This also removes the final jshint warnings from this file.
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Profiling was done using Firebug in Firefox 31 on Linux x86_64. Test was
performed as follows:
- rrd generated using collectd with default rrdtool settings.
- CPU utilization was visualized with 8 lines (idle, nice, etc.).
- The data has gaps between 20% and 40% and 55% and 85% (were no data
was collected).
- The measured performance was from advancing the data 40% to the right
(there are no gaps before that).
The total running time is 18859.094ms (old), 5151.822ms (new). In the
below profiles, common functions with similar running times and call
counts were omitted. Columns in the profile table: function, call count,
time spent in the function, average time spent per call in *total*
(including other functions called by the function) and percentage of the
total running time. The RrdGraph.data_calc function was not called much,
but seems to be heavy enough to include in the trace.
Profile for old implementation:
- getEndianByteAt 246959 12200.42ms 0.063ms 64.69%
- getDoubleAt 30306 3183.393ms 0.612ms 16.88%
- RRDRRA.getEl 30306 1177.33ms 0.665ms 6.24%
- RRDRRA.calc_idx 30306 449.201ms 0.015ms 2.38%
- (RrdDataFile.build 47 431.986ms total=21189.434ms 2.29%)
- getByteAt 254290 327.369ms 0.013ms 1.74%
- (2 functions omitted)
- getCStringAt 752 103.308ms 0.271ms 0.55%
- RrdRpn.calc 5504 98.55ms 0.018ms 0.52%
- (1 function omitted)
- (RrdGraph.data_calc 1 75.417ms total=174.535ms 0.4%)
- getLongAt 1128 65.796ms 0.212ms 0.35%
Profile for new implementation:
- RRDRRA.getEl 32280 1202.446ms 0.065ms 23.34%
- RrdRpn.calc 43968 848.693ms 0.019ms 16.47%
(probably includes the getByteAt call which is not visible in trace)
- (RrdGraph.data calc 2 616.648ms total=1466.432ms 11.97%)
- getDoubleAt 32280 460.894ms 0.014ms 8.95%
- (RrdDataFile.build 48 438.1ms total=2719.07ms 8.5%)
- (RRDRRA.calc_idx 32280 436.375ms total=436.375ms 8.47%)
- (10 functions omitted)
- getLongAt 1152 16.273ms 0.014ms 0.32%
- (2 functions omitted)
- getCStringAt 768 13.651ms 0.018ms 0.26%
A second test was performed on a graph with no visible data points. I
dragged it to the left to get in the future with only NaN values. Then
the profile started. It turns out that the byte readings are not
dominating here, 99% of the time was spent in RrdRpn.calc and
RrdGraph.data_calc:
- (old) RrdRpn.calc 3.14k 58493s 0.019ms
- (new) RrdRpn.calc 3.10k 56912s 0.018ms
- RrdGraph.data_calc (n=2) took about 46 seconds for both.
- getByteAt (n=12096): 0.014ms (old), invisible/inlined (new)
- getEndianByteAt (n=4608): 0.040ms (old only)
- getCStringAt (n=768): 0.285ms (old), 0.018ms (new)
- getLongAt (n=1152): 0.233ms (old), 0.014ms (new)
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Rename switch_endian to littleEndian to be more explicit (the meaning
is now inversed too). Make getEndianByteAt private since it is an
implementation detail.
Drop getStringAt as this is not used in this library. Move getCharAt
above getCStringAt since they are more related.
Move the methods definition for the current implementation to a new
function.
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These parameters are not used in this library. Should it ever be
necessary to process a slice of data, then the caller should do so.
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Use conditional compilation for the antique browsers that provide
VBScript support.
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commit 2a74a333ff143499b465234f0395a4aad7bdaa78 ("Upgrade to
javascriptrrd ver 1.1.1") converted getByteAt calls to a getEndianByteAt
call, but this also introduced a branch operation. Since endianess is
dependent on the file, we can move the switch_endian check outside the
function.
Performance improved from 0.148ms (n=336k) to .039ms (n=384k) which
translates to about 30 seconds!
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Added jshint comment on top, added "use strict". Added missing
semi-colons, converted to '===' (after validation).
Added comment for `typeof strData == "unknown"`. Break one long line
over two lines.
There are no other changes except for whitespace and line ending
changes. Check with `git diff -w`.
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Source: https://github.com/manuelluis/jsrrdgraph@276b880
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