renyd123 opened a new issue, #42097: URL: https://github.com/apache/arrow/issues/42097
### Describe the usage question you have. Please include as many useful details as possible. I encountered a performance issue when calling the FileReader::RowGroup(i)->ReadTable interface in a multi-threaded environment. For a RowGroup with 1 million rows, when the number of threads is 1, FileReader::RowGroup(i)->ReadTable takes around 40ms. However, as the number of threads increases, the execution time also increases gradually. When the number of threads reaches 16, the execution time reaches around 250ms. This is reflected in the overall file parsing performance, where using 16 threads is only about 5 times faster than using a single thread. Is this issue caused by locking or I/O in the interface? Are there any other methods for multi-threaded parsing? ### Component(s) C++ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
