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ircd::ios: Add epoch history in circular buffer for profiling w/ console cmd.

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This commit is contained in:
Jason Volk 2020-08-02 05:45:35 -07:00
parent ccbd6c80bb
commit 59197ee2d5
3 changed files with 136 additions and 4 deletions
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4
include/ircd/ios.h
View file

@ -108,7 +108,9 @@ struct ircd::ios::descriptor
std::unique_ptr<struct stats> stats;
std::function<void *(handler &, const size_t &)> allocator;
std::function<void (handler &, void *const &, const size_t &)> deallocator;
bool continuation;
std::vector<std::array<uint64_t, 2>> history; // epoch, cycles
uint8_t history_pos {0};
bool continuation {false};
descriptor(const string_view &name,
const decltype(allocator) & = default_allocator,

27
ircd/ios.cc
View file

@ -100,6 +100,14 @@ ircd::ios::descriptor::descriptor(const string_view &name,
{
deallocator?: default_deallocator
}
,history_pos
{
0
}
,history
(
256, {0}
)
,continuation
{
continuation
@ -169,6 +177,11 @@ ircd::ios::descriptor::stats::operator+=(const stats &o)
// handler
//
namespace ircd::ios
{
constexpr bool profile_history {false};
}
decltype(ircd::ios::handler::current)
thread_local
ircd::ios::handler::current;
@ -226,6 +239,14 @@ noexcept
stats.slice_last = slice_stop - handler->ts;
stats.slice_total += stats.slice_last;
if constexpr(profile_history)
{
assert(descriptor.history_pos < descriptor.history.size());
descriptor.history[descriptor.history_pos][0] = handler::epoch;
descriptor.history[descriptor.history_pos][1] = stats.slice_last;
++descriptor.history_pos;
}
assert(handler::current == handler);
handler::current = nullptr;
}
@ -236,14 +257,14 @@ ircd::ios::handler::enter(handler *const &handler)
noexcept
{
assert(!handler::current);
handler::current = handler;
++handler::epoch;
assert(handler && handler->descriptor);
auto &descriptor(*handler->descriptor);
assert(descriptor.stats);
auto &stats(*descriptor.stats);
handler::current = handler;
++handler::epoch;
++stats.calls;
const auto last_ts

109
modules/console.cc
View file

@ -1663,6 +1663,115 @@ console_cmd__ios(opt &out, const string_view &line)
return true;
}
bool
console_cmd__ios__record(opt &out, const string_view &line)
{
std::map<uint64_t, std::tuple<uint64_t, const ios::descriptor *>> map;
for(const auto *const &descriptor : ios::descriptor::list)
{
assert(descriptor);
const auto &d(*descriptor);
const auto &history(d.history);
const auto &pos(d.history_pos);
for(size_t i(pos); i < 256; ++i)
{
if(!history[i][0])
continue;
map.emplace(history[i][0], std::make_tuple(history[i][1], descriptor));
}
for(size_t i(0); i < pos; ++i)
{
if(!history[i][0])
continue;
map.emplace(history[i][0], std::make_tuple(history[i][1], descriptor));
}
}
uint64_t last(0);
for(const auto &[epoch, tuple] : map)
{
const auto &[cyc, desc]
{
tuple
};
const char ch
{
epoch == last + 1? '|': 'T'
};
out
<< " " << ch
<< std::right
<< " " << std::setw(12) << epoch
<< " " << std::setw(12) << cyc
<< " " << std::left << std::setw(36) << desc->name;
out
<< std::endl;
last = epoch;
}
return true;
}
bool
console_cmd__ios__history(opt &out, const string_view &line)
{
for(const auto *const &descriptor : ios::descriptor::list)
{
assert(descriptor);
const auto &d(*descriptor);
const auto &history(d.history);
const auto &pos(d.history_pos);
out
<< std::left << std::setw(3) << d.id
<< " " << std::left << std::setw(48) << d.name
<< std::endl;
size_t k(0);
for(size_t i(pos); i < 256; ++i)
{
if(!history[i][0])
continue;
out
<< "[" << std::right << std::setw(9) << history[i][0]
<< " |" << std::right << std::setw(9) << history[i][1]
<< "] ";
if(++k % 12 == 0)
out << std::endl;
}
for(size_t i(0); i < pos; ++i)
{
if(!history[i][0])
continue;
out
<< "[" << std::right << std::setw(9) << history[i][0]
<< " |" << std::right << std::setw(9) << history[i][1]
<< "] ";
if(++k % 12 == 0)
out << std::endl;
}
out << std::endl;
}
return true;
}
bool
console_cmd__ios__depth(opt &out, const string_view &line)
{