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c52f3349d1
The --trace-threads option can now be used to perform tracing on a thread separate from the main thread when using VCD tracing (with --trace-threads 1). For FST tracing --trace-threads can be 1 or 2, and --trace-fst --trace-threads 1 is the same a what --trace-fst-threads used to be (which is now deprecated). Performance numbers on SweRV EH1 CoreMark, clang 6.0.0, Intel i7-3770 @ 3.40GHz, IO to ramdisk, with numactl set to schedule threads on different physical cores. Relative speedup: --trace -> --trace --trace-threads 1 +22% --trace-fst -> --trace-fst --trace-threads 1 +38% (as --trace-fst-thread) --trace-fst -> --trace-fst --trace-threads 2 +93% Speed relative to --trace with no threaded tracing: --trace 1.00 x --trace --trace-threads 1 0.82 x --trace-fst 1.79 x --trace-fst --trace-threads 1 1.23 x --trace-fst --trace-threads 2 0.87 x This means FST tracing with 2 extra threads is now faster than single threaded VCD tracing, and is on par with threaded VCD tracing. You do pay for it in total compute though as --trace-fst --trace-threads 2 uses about 240% CPU vs 150% for --trace-fst --trace-threads 1, and 155% for --trace --trace threads 1. Still for interactive use it should be helpful with large designs.
43 lines
1.2 KiB
Perl
Executable File
43 lines
1.2 KiB
Perl
Executable File
#!/usr/bin/perl
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if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
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# DESCRIPTION: Verilator: Verilog Test driver/expect definition
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#
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# Copyright 2003-2020 by Wilson Snyder. This program is free software; you
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# can redistribute it and/or modify it under the terms of either the GNU
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# Lesser General Public License Version 3 or the Perl Artistic License
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# Version 2.0.
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# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
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# Test tracing with two models instanced
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scenarios(vlt_all => 1);
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top_filename("t_trace_two_a.v");
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compile(
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make_main => 0,
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verilator_make_gmake => 0,
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top_filename => 't_trace_two_b.v',
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VM_PREFIX => 'Vt_trace_two_b',
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verilator_flags2 => ['--trace-fst --trace-threads 1 -DTEST_FST'],
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);
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compile(
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make_main => 0,
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top_filename => 't_trace_two_a.v',
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verilator_flags2 => ['-exe', '--trace-fst --trace-threads 1',
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'-DTEST_FST',
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"$Self->{t_dir}/t_trace_two_cc.cpp"],
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v_flags2 => ['+define+TEST_DUMP'],
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);
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execute(
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check_finished => 1,
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);
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if ($Self->{vlt_all}) {
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fst_identical($Self->trace_filename, $Self->{golden_filename});
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}
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ok(1);
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1;
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