Hello,
I am experiencing a drop in throughput when migrating my logging library to libfmt 11 compared to libfmt 10.2.1.
I haven't been able to figure out yet if this is something related to my project or the newer version of libfmt, but the only change is the libfmt library.
Environment
Compiler: GCC 13
OS: Linux RHEL
Build Configuration: Release build with -O3 -DNDEBUG -std=gnu++20
libfmt: Header-only version
#include "quill/bundled/fmt/base.h"
#include "quill/bundled/fmt/format.h"
#include <string>
#include <iostream>
#include <chrono>
#include <atomic>
void ClobberMemory() {
std::atomic_signal_fence(std::memory_order_acq_rel);
}
int main()
{
using format_buffer_t = fmt::basic_memory_buffer<char>;
fmt::string_view format_str = "Hello, {}. The answer is {} and {}.";
int a = 1;
int b = 2345;
int c = 6789;
auto args = fmt::make_format_args(a, b, c);
const int n = 10'000'000;
auto start = std::chrono::high_resolution_clock::now();
for (int iteration = 0; iteration < n; ++iteration)
{
format_buffer_t buffer;
fmt::vformat_to(std::back_inserter(buffer), format_str, args);
}
ClobberMemory();
auto end = std::chrono::high_resolution_clock::now();
std::chrono::duration<double> duration = end - start;
double total_time = duration.count() * 1000; // Convert to milliseconds
std::cout << "Total time for formatting " << n << " strings: "
<< total_time << " ms" << std::endl;
return 0;
}
I ran the above several times for both versions and it seems that version 10.2.1 is always faster. I am running it on an isolated cpu and nothing else is running on the whole box
Are there any known changes in libfmt 11 that could explain this difference?
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4