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Improve run-time profiling

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The --prof-threads option has been split into two independent options:
1. --prof-exec, for collecting verilator_gantt and other execution
related profiling data, and
2. --prof-pgo, for collecting data needed for PGO

The implementation of execution profiling is extricated from
VlThreadPool and is now a separate class VlExecutionProfiler. This means
--prof-exec can now be used for single-threaded models (though it does
not measure a lot of things just yet). For consistency VerilatedProfiler
is renamed VlPgoProfiler. Both VlExecutionProfiler and VlPgoProfiler are
in verilated_profiler.{h/cpp}, but can be used completely independently.

Also re-worked the execution profile format so it now only emits events
without holding onto any temporaries. This is in preparation for some
future optimizations that would be hindered by the introduction of function
locals via AstText.

Also removed the Barrier event. Clearing the profile buffers is not
notably more expensive as the profiling records are trivially
destructible.
This commit is contained in:
Geza Lore
2022-03-27 15:57:30 +02:00
parent c7440b250f
commit b1b5b5dfe2
40 changed files with 900 additions and 712 deletions
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include/verilated.cpp
+18 -15
View File
@@ -2280,7 +2280,7 @@ VerilatedContext::VerilatedContext()
: m_impdatap{new VerilatedContextImpData} {
Verilated::lastContextp(this);
Verilated::threadContextp(this);
m_ns.m_profThreadsFilename = "profile_threads.dat";
m_ns.m_profExecFilename = "profile_exec.dat";
m_ns.m_profVltFilename = "profile.vlt";
m_fdps.resize(31);
std::fill(m_fdps.begin(), m_fdps.end(), static_cast<FILE*>(nullptr));
@@ -2348,21 +2348,21 @@ void VerilatedContext::gotFinish(bool flag) VL_MT_SAFE {
const VerilatedLockGuard lock{m_mutex};
m_s.m_gotFinish = flag;
}
void VerilatedContext::profThreadsStart(vluint64_t flag) VL_MT_SAFE {
void VerilatedContext::profExecStart(vluint64_t flag) VL_MT_SAFE {
const VerilatedLockGuard lock{m_mutex};
m_ns.m_profThreadsStart = flag;
m_ns.m_profExecStart = flag;
}
void VerilatedContext::profThreadsWindow(vluint64_t flag) VL_MT_SAFE {
void VerilatedContext::profExecWindow(vluint64_t flag) VL_MT_SAFE {
const VerilatedLockGuard lock{m_mutex};
m_ns.m_profThreadsWindow = flag;
m_ns.m_profExecWindow = flag;
}
void VerilatedContext::profThreadsFilename(const std::string& flag) VL_MT_SAFE {
void VerilatedContext::profExecFilename(const std::string& flag) VL_MT_SAFE {
const VerilatedLockGuard lock{m_mutex};
m_ns.m_profThreadsFilename = flag;
m_ns.m_profExecFilename = flag;
}
std::string VerilatedContext::profThreadsFilename() const VL_MT_SAFE {
std::string VerilatedContext::profExecFilename() const VL_MT_SAFE {
const VerilatedLockGuard lock{m_mutex};
return m_ns.m_profThreadsFilename;
return m_ns.m_profExecFilename;
}
void VerilatedContext::profVltFilename(const std::string& flag) VL_MT_SAFE {
const VerilatedLockGuard lock{m_mutex};
@@ -2524,12 +2524,15 @@ void VerilatedContextImp::commandArgVl(const std::string& arg) {
"Exiting due to command line argument (not an error)");
} else if (arg == "+verilator+noassert") {
assertOn(false);
} else if (commandArgVlUint64(arg, "+verilator+prof+threads+start+", u64)) {
profThreadsStart(u64);
} else if (commandArgVlUint64(arg, "+verilator+prof+threads+window+", u64, 1)) {
profThreadsWindow(u64);
} else if (commandArgVlString(arg, "+verilator+prof+threads+file+", str)) {
profThreadsFilename(str);
} else if (commandArgVlUint64(arg, "+verilator+prof+exec+start+", u64)
|| commandArgVlUint64(arg, "+verilator+prof+threads+start+", u64)) {
profExecStart(u64);
} else if (commandArgVlUint64(arg, "+verilator+prof+exec+window+", u64, 1)
|| commandArgVlUint64(arg, "+verilator+prof+threads+window+", u64, 1)) {
profExecWindow(u64);
} else if (commandArgVlString(arg, "+verilator+prof+exec+file+", str)
|| commandArgVlString(arg, "+verilator+prof+threads+file+", str)) {
profExecFilename(str);
} else if (commandArgVlString(arg, "+verilator+prof+vlt+file+", str)) {
profVltFilename(str);
} else if (commandArgVlUint64(arg, "+verilator+rand+reset+", u64, 0, 2)) {