Bug#808579: Not fixed?
On 26/12/15 15:14, Niels Thykier wrote: Eugen Dedu: Hi, I have had the same problem since apt 1.1 version. Now I have 1.1.6, but this bug is still not fixed: apt-get update takes much time during rred phase. Hi, For reference, the following commit was done today, which might be of interest: https://anonscm.debian.org/cgit/apt/apt.git/commit/?id=0b29c72 """ Use a hardcoded buffer size of 4096 to fix performance The code uses memmove() to move parts of the buffer to the front when the buffer is only partially read. By simply reading one page at a time, the maximum size of bytes that must be moved has a hard limit, and performance improves: In one test case, consisting of a 430 MB Contents file, and a 75K PDiff, applying the PDiff previously took about 48 seconds and now completes in 2 seconds. Indeed, it is extremely fast now, thank you! Further speed up can be achieved by buffering writes, they account for about 60% of the run-time now. """ It will probably be a part of the next APT release. -- Eugen
Bug#808579: Not fixed?
Eugen Dedu: > Hi, > > I have had the same problem since apt 1.1 version. Now I have 1.1.6, > but this bug is still not fixed: apt-get update takes much time during > rred phase. > Hi, For reference, the following commit was done today, which might be of interest: https://anonscm.debian.org/cgit/apt/apt.git/commit/?id=0b29c72 """ Use a hardcoded buffer size of 4096 to fix performance The code uses memmove() to move parts of the buffer to the front when the buffer is only partially read. By simply reading one page at a time, the maximum size of bytes that must be moved has a hard limit, and performance improves: In one test case, consisting of a 430 MB Contents file, and a 75K PDiff, applying the PDiff previously took about 48 seconds and now completes in 2 seconds. Further speed up can be achieved by buffering writes, they account for about 60% of the run-time now. """ It will probably be a part of the next APT release. Thanks, ~Niels signature.asc Description: OpenPGP digital signature
Bug#808579: Not fixed?
Hi, I have had the same problem since apt 1.1 version. Now I have 1.1.6, but this bug is still not fixed: apt-get update takes much time during rred phase. -- Eugen
