问题
So i have a large file which has ~2 million lines. The file reading is a bottleneck in my code. Any suggested ways and expert opinion to read the file faster is welcome. Order of reading lines from that text file is unimportant. All lines are pipe '|' separated fixed length records.
What i tried? I started parallel StreamReaders and made sure that resource is locked properly but this approach failed as i now had multiple threads fighting to get hold of the single StreamReader and wasting more time in locking etc thereby making the code slow down further.
One intuitive approach is to break the file and then read it, but i wish to leave the file intact and still be somehow able to read it faster.
回答1:
I would try maximizing my buffer size. The default size is 1024, increasing this should increase performance. I would suggest trying other buffer size options.
StreamReader(Stream, Encoding, Boolean, Int32) Initializes a new instance of the StreamReader class for the specified stream, with the specified character encoding, byte order mark detection option, and buffer size.
来源：https://stackoverflow.com/questions/24688645/read-file-faster-by-multiple-readers