dc5c259069
Improve tracing performance. ( #2257 )
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* Improve tracing performance.
Various tactics used to improve performance of both VCD and FST tracing:
- Both: Change tracing functions to templates to take variable widths as
template parameters. For VCD, subsequently specialize these to the
values used by Verilator. This avoids redundant instructions and hard
to predict branches.
- Both: Check for value changes via direct pointer access into the
previous signal value buffer. This eliminates a lot of simple pointer
arithmetic instructions form the tracing code.
- Both: Verilator provides clean input, no need to mask out used bits.
- VCD: pre-compute identifier codes and use memory copy instead of
re-computing them every time a code is emitted. This saves a lot of
instructions and hard to predict branches. The added D-cache misses
are cheaper than the removed branches/instructions.
- VCD: re-write the routines emitting the changes to be more efficient.
- FST: Use previous signal value buffer the same way as the VCD tracing
code, and only call the FST API when a change is detected.
Performance as measured on SweRV EH1, with the pre-canned CoreMark
benchmark running from DCCM/ICCM, clang 6.0.0, Intel i7-3770 @ 3.40GHz,
and IO to ramdisk:
+--------------+---------------+----------------------+
| VCD | FST | FST separate thread |
| (--trace) | (--trace-fst) | (--trace-fst-thread) |
------------+-----------------------------------------------------+
Before | 30.2 s | 121.1 s | 69.8 s |
============+==============+===============+======================+
After | 24.7 s | 45.7 s | 32.4 s |
------------+--------------+---------------+----------------------+
Speedup | 22 % | 256 % | 215 % |
------------+--------------+---------------+----------------------+
Rel. to VCD | 1 x | 1.85 x | 1.31 x |
------------+--------------+---------------+----------------------+
In addition, FST trace size for the above reduced by 48%.
2020-04-14 00:13:10 +01:00
05f213c266
VCD tracing speed improvements ( #2246 )
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* Don't inline VCD dump functions
Improves model speed with tracing. Measured on SweRW cmark:
- GCC 5.5 ~3% faster
- Clang 6.0 ~12% faster (!)
* Remove redundant test from VCD bit tracing.
Improves model speed with tracing. Measured on SweRW cmark:
- GCC 5.5 ~7.5% faster
- Clang 6.0 ~1.5% faster
2020-04-09 08:19:26 -04:00
e07e9390f6
Internals: clang-format cleanups. No functional change.
2020-04-04 14:09:21 -04:00
1ce360ed5b
Add SPDX license identifiers. No functional change.
2020-03-21 11:24:24 -04:00
905067d13f
Fix $dumpvar multithreaded assert, broke last commit.
2020-03-02 07:43:10 -05:00
30a33a6104
Add support for and , #2126 .
2020-03-01 21:39:23 -05:00
9978cbfa5c
Fix tracing -1 index arrays. Closes #2090 .
2020-01-08 07:32:31 -05:00
f23fe8fd84
Update copyright year.
2020-01-06 18:05:53 -05:00
5c361efaea
Internals: Minor format cleanups. No functional change.
2019-12-22 18:09:46 -05:00
35e9489f33
Includes: Allow VCD trace of 64 bit array.
2019-12-05 22:25:30 -05:00
f87107e757
Tests etc: Cleanup some clang-format suggestions. No functional change.
2019-11-09 20:35:12 -05:00
6ffbb7cabf
Internals: Remove extra semicolons. No functional change.
2019-06-11 18:31:06 -04:00
96c70ea2df
Internals: Fix some long lines in include files. No functional change.
...
When merging, recommend using "git merge -Xignore-all-space"
2019-05-14 22:49:32 -04:00
a2a7021914
Reorder VCD codes for better viewer packing.
2019-05-06 18:55:38 -04:00
8a4aeddbb0
Copyright year update.
2019-01-03 19:17:22 -05:00
8170391573
Internals: Fix spacing of comments. No functional change.
2018-11-28 19:59:10 -05:00
304a24d03a
Internals: Fix many clang-tidy issues. No functional change intended.
2018-10-14 18:39:33 -04:00
d87b9d25ca
Internals: Cleanup and standardize include order. No functional change intended.
2018-10-14 13:59:40 -04:00
8f838433df
Internals: Fix spacing and style of v4 changes. No functional change.
2018-08-23 05:22:34 -04:00
0b84222500
Includes: Fix spacing and style in prep for new LXT2. No functional change.
2018-08-22 19:14:06 -04:00
8e65d93d6d
Copyright year update. No functional change.
2018-01-02 18:05:06 -05:00
add5cc8b56
Internals: Add VL_UNCOPYABLE to make classes uncopyable. No functional change intended.
2017-11-01 18:51:41 -04:00
f91bac7b31
Rewrite include libraries to support VL_THREADED towards future threading
2017-10-26 21:51:51 -04:00
ad693d67b2
Mark Verilated functions with multithreaded status. No functional change.
2017-10-26 20:05:42 -04:00
c17c81254e
Internals: Use = delete via a macro for a bit of C++11 forward compatibility
2017-10-25 20:00:38 -04:00
32874fa848
Internals: Misc VCD code cleanups. No functional change.
2017-10-21 17:53:23 -04:00
d21824cbae
Internals: Refactor verilated_vcd to move singleton into only .cpp. No functional change intended.
2017-10-14 13:00:25 -04:00
0ac116bb4e
Internals: Favor C++ cast style. No functional change intended.
2017-10-07 15:01:19 -04:00
89ac6ab594
Fix memory leak in VerilatedVcd dumps, bug1222 partial.
2017-10-02 18:49:00 -04:00
3f14e649b5
Internals: Use singleton in place of global
2017-09-23 07:44:52 -04:00
c2e8062f84
Verilated headers no longer "use namespace std;"
2017-09-23 07:32:37 -04:00
70daadf987
Fix cpp-check warnings; support XML format 2
2017-07-06 20:25:59 -04:00
6c87724af8
Support set_time_unit/set_time_precision in C traces, msg2261.
2017-06-20 19:33:58 -04:00
e6d7e7e329
Version bump
2017-01-15 12:13:13 -05:00
b738d1960a
Copyright year update
2016-01-06 20:36:41 -05:00
318ded4198
Internals: Cleanup cppcheck warnings.
2015-10-03 22:33:06 -04:00
c0df07c86f
Commentary: Update contributor list
2015-03-13 07:38:17 -04:00
005b4b7609
Updated - add VerilatedVcdFile to allow real-time waveforms, bug890.
2015-03-05 20:21:48 -05:00
a0fd065dcf
Add VerilatedVcdFile to allow real-time waveforms, bug890.
2015-03-05 08:54:57 -05:00
8323092a0c
Fix cppcheck warnings. No functional change.
2015-02-09 21:05:27 -05:00
4c91ade61d
Copyright year update
2015-01-07 18:25:53 -05:00
d33ad7600b
Commentary. Cleanup stale SystemPerl references.
2014-11-23 22:00:00 -05:00
3234fa15ef
Fix trace overflow on huge arrays, bug834.
2014-11-05 22:22:27 -05:00
4422de0c6c
Copyright year update.
2014-01-06 19:28:57 -05:00
e6808a787c
Fix opening a VerilatedVcdC file multiple times, msg1021.
2013-02-23 21:10:25 -05:00
a8bbf7231b
Copyright year update.
2013-01-01 09:42:59 -05:00
50edef4ab2
Add Emacs indentation line. No functional change
2012-04-12 21:08:20 -04:00
c2c7c7bd9a
Copyright year update
2012-01-15 10:26:28 -05:00
df1da3dda9
Internals: Fix cppcheck warnings; no functional change intended
2011-08-04 21:58:45 -04:00
c83f2a4abd
Internals: Fix preincrements to reduce cppcheck warnings
2011-08-04 21:15:24 -04:00
71c1f00ec2
Copyright year update
2011-01-01 18:21:19 -05:00
495585830d
Fix trace files with empty modules crashing some viewers.
2010-03-22 18:38:24 -04:00
e40fbf1470
Verilated: Add missing VL_UNLIKELYs
2010-02-03 06:56:20 -05:00
53fda88d4c
VCD_VERSION is unused
2010-02-01 21:41:47 -05:00
11e702c430
SystemPerl is no longer required for tracing.
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Applications must use VerilatedVcdC class in place of SpTraceVcdC.
2010-01-24 18:37:01 -05:00
Geza Lore
Wilson Snyder