Patrick Schlangen <patr...@schlangen.me> 于2020年6月19日周五 上午4:31写道：
> Hi, > > interesting thread. > > Am 18.06.2020 um 12:09 schrieb Daniel Stenberg via curl-library < > curl-library@cool.haxx.se>: > > The question is then of course still what IDM does that makes it that much > faster or perhaps what curl should do to improve. But without more details > and knowledge of IDM's set of tricks, I'm not sure we will achieve that > right now. > > > I’ve downloaded that program out of curiosity and compared it against curl > on macOS. > > curl is running natively on macOS, IDM in a Windows 10 VMware Fusion > virtual machine on the same machine. I only tested a couple of times with > the file (http://speedtest-ny.turnkeyinternet.net/1000mb.bin) and timed > the total download time (using `time` for curl and using a stopwatch for > IDM). > > Interestingly, IDM showed max 13.5 MB/s with an average total download > time of 93 seconds, while curl showed max 12.0 MB/s and took 86 seconds for > the same file on average. So actually curl was faster but displayed the > lower max transfer rate. > > Important: Start your stopwatch already when you are in the dialog shown > in my attached screenshot. They work with a little trick here: They start > downloading in the background before you even press "Start Download"! (See > network activity in my screenshot...) > > @Hongyi: I’d recommend to retry the tests while measuring the time it > takes to download the file instead of relying on the displayed download > speed. Either curl could be too pessimistic in the displayed speed or IDM > could be too optimistic. (In the end the selling point of their product is > to be faster than the competitors.) > > Disclaimer: I didn’t spend much time, and from a statistical point it’s > probably not valid to draw any conclusions from my experiments. > I've noted that the real URL used by IDM for the file ( http://speedtest-ny.turnkeyinternet.net/1000mb.bin) is the following: http://ipv4.download.thinkbroadband.com/1GB.zip Then I retried with the above URL for several times to benchmark the total duration for each downloading progress. Anyway, the ultimate purpose is the short time-duration for the same job. The results are as follows: 1. IDM with single connection setting vs curl: They basically show the same time-durations for my case: around 58 ~ 59 secs. 2. IDM with multiple connections/multi-threading setting vs PyIDM ( https://github.com/pyIDM/PyIDM): They still basically show the same time-durations for my case: around 45 ~ 49 secs. Regards -- Hongyi Zhao <hongyi.z...@gmail.com>
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