Performance test

Signed-off-by: JCW <a1q123456@users.noreply.github.com>

include/xrpl/basics/Log.h

@@ -155,7 +155,7 @@ private:
     mutable std::mutex batchMutex_;
     static constexpr size_t BATCH_BUFFER_SIZE = 64 * 1024;  // 64KB buffer
     std::array<char, BATCH_BUFFER_SIZE> batchBuffer_{};
-    std::span<char> writeBuffer_;  // Points to available write space
+    static thread_local std::span<char> writeBuffer_;  // Points to available write space
     std::span<char> readBuffer_;   // Points to data ready to flush
     std::chrono::steady_clock::time_point lastFlush_ =
         std::chrono::steady_clock::now();

src/libxrpl/basics/Log.cpp

@@ -37,6 +37,7 @@
 #include <vector>
 
 namespace ripple {
+thread_local std::span<char> Logs::writeBuffer_{};
 
 namespace {
 constexpr auto FLUSH_INTERVAL =
@@ -129,8 +130,8 @@ Logs::File::write(std::string_view text)
 
 Logs::Logs(beast::severities::Severity thresh)
     : thresh_(thresh)  // default severity
-    , writeBuffer_(
-          batchBuffer_)  // Initially, entire buffer is available for writing
+    // , writeBuffer_(
+    //       batchBuffer_)  // Initially, entire buffer is available for writing
     , readBuffer_(batchBuffer_.data(), 0)  // No data ready to flush initially
 {
 }