On 5/19/06, Xi Wang <xi.wang@gmail.com> wrote:
Nice:-) I'd like to see more methods such as push_back, though resize could make it but not so convenient. And are there any plans for supporting insert/erase a record or a range of records?
resize routine is very expensive, thus it should be invoked as rare as posible. push_back() makes resize each time called, so it is not effective. insert/erase question: what to do with the tail of the file in this cases?
Here are some more timings, FYI. All tests were performed on WinXP SP2 with P4 3GHz HT, 1G memory, using test.cpp compiled by VC8 (cl /O2 /EHsc). Sequential tests read/write on a file sized 40M, while random tests were also limited to 1,000,000 iterations.
Test type stub cstdio fstream randfile ---------------------------------------------- Sequential read 0.03 6.87 23.76 0.05 Sequential write 1.70 10.09 11.61 1.97 Random read 0.03 4.31 9.58 0.05 Random write 0.09 7.42 13.56 0.09 Random read/write 0.14 6.95 13.34 0.14
ps: cstdio and fstream implementations are those shipped with VC8.
Thank you very much for performance testing. -- Svyatoslav Trukhanov, Oleksii Ursulenko