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I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2. Is it enough to protect a shared QTextSt...
#8: Post edited
by
Shree
·
2023-08-24T05:50:09Z (about 1 year ago)
Remove un necessary text. Text complain about system. If that's a problem, it's must be post on meta not in question.
Write to same file from multiple threads
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
- Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
- EDIT:
@dmckee Sorry, I tried to post a comment but failed. I could click "post" but the comment didn't appear.Your solution is how I have solved it currently (well, a bit more complex but it boils down exactly to your idea). However moving the file work into a single writer thread does not scale.I have a lot of threads writing very big amounts of data. This means the writer thread receives a big load and (more important) queued events need to carry a lot of data (which means a lot of RAM consumption). This gets even more nasty in case the writer thread is too slow: It will pile up events consuming virtually all RAM in the system. This is why I would prefer a mutex like solution very much. Alas, is that possible?
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
- Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
- EDIT:
- For now using [dmckee's](https://software.codidact.com/users/52997)
- solution I have solved it (well, a bit more complex but it boils down exactly to your idea). However moving the file work into a single writer thread does not scale.
- I have a lot of threads writing very big amounts of data. This means the writer thread receives a big load and (more important) queued events need to carry a lot of data (which means a lot of RAM consumption). This gets even more nasty in case the writer thread is too slow. It will pile up events consuming virtually all RAM in the system. This is why I would prefer a mutex like solution very much. Alas, is that possible?
#7: Post edited
by
Monica Cellio
·
2021-04-25T18:20:19Z (over 3 years ago)
trying to fix tags (per bug report on meta)
#6: Post edited
by
Silicomancer
·
2021-04-24T21:35:01Z (over 3 years ago)
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
- Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
- EDIT:
- @dmckee Sorry, I tried to post a comment but failed. I could click "post" but the comment didn't appear.
- Your solution is how I have solved it currently (well, a bit more complex but it boils down exactly to your idea). However moving the file work into a single writer thread does not scale.
I have a lot of threads writing very big amounts of data. This means the writer thread receives a big load and (more important) queued events need to carry a lot of data (which means a lot of RAM consumption). This gets nasty in case the writer thread is too slow: It will pile up events consuming virtually all RAM in the system. This is why I would prefer a mutex like solution very much. Alas, is that possible?
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
- Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
- EDIT:
- @dmckee Sorry, I tried to post a comment but failed. I could click "post" but the comment didn't appear.
- Your solution is how I have solved it currently (well, a bit more complex but it boils down exactly to your idea). However moving the file work into a single writer thread does not scale.
- I have a lot of threads writing very big amounts of data. This means the writer thread receives a big load and (more important) queued events need to carry a lot of data (which means a lot of RAM consumption). This gets even more nasty in case the writer thread is too slow: It will pile up events consuming virtually all RAM in the system. This is why I would prefer a mutex like solution very much. Alas, is that possible?
#5: Post edited
by
Silicomancer
·
2021-04-24T21:27:57Z (over 3 years ago)
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
- Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
- EDIT:
- @dmckee Sorry, I tried to post a comment but failed. I could click "post" but the comment didn't appear.
- Your solution is how I have solved it currently (well, a bit more complex but it boils down exactly to your idea). However moving the file work into a single writer thread does not scale.
- I have a lot of threads writing very big amounts of data. This means the writer thread receives a big load and (more important) queued events need to carry a lot of data (which means a lot of RAM consumption). This gets nasty in case the writer thread is too slow: It will pile up events consuming virtually all RAM in the system. This is why I would prefer a mutex like solution very much. Alas, is that possible?
#4: Post edited
by
Alexei
·
2021-04-24T18:50:33Z (over 3 years ago)
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
- Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
#3: Post edited
by
Silicomancer
·
2021-04-24T08:51:25Z (over 3 years ago)
#2: Post edited
by
Silicomancer
·
2021-04-23T23:29:18Z (over 3 years ago)
I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic.- Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
- I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2.
- Is it enough to protect a shared QTextStream/QFile pair using a QMutex?
#1: Initial revision
by
Silicomancer
·
2021-04-23T23:05:17Z (over 3 years ago)
Write to same file from multiple threads
I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. Is it enough to protect a shared QTextStream/QFile pair using a QMutex?