Using the following, we noticed that the process is cpu bound at close to 100% and transfer time drops from 300MBytes/sec to 7Mbytes/sec for a 10GiB file.
curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 1L); curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 30L); Looking at pstack, it is spending almost all its’ time in: #0 0x00007f7be042503a in curlx_tvdiff () from /opt/quantum/curl/lib/libcurl.so.4 #1 0x00007f7be044d126 in multi_addtimeout () from /opt/quantum/curl/lib/libcurl.so.4 #2 0x00007f7be044d2e5 in Curl_expire () from /opt/quantum/curl/lib/libcurl.so.4 #3 0x00007f7be043d886 in Curl_speedcheck () from /opt/quantum/curl/lib/libcurl.so.4 #4 0x00007f7be04477b8 in Curl_readwrite () from /opt/quantum/curl/lib/libcurl.so.4 #5 0x00007f7be044e82a in multi_runsingle () from /opt/quantum/curl/lib/libcurl.so.4 #6 0x00007f7be044f445 in curl_multi_perform () from /opt/quantum/curl/lib/libcurl.so.4 #7 0x00007f7be04487ae in curl_easy_perform () from /opt/quantum/curl/lib/libcurl.so.4 Is this a bug or are we using the wrong options etc. Thanks. Colin Ngam ---------------------------------------------------------------------- The information contained in this transmission may be confidential. Any disclosure, copying, or further distribution of confidential information is not permitted unless such privilege is explicitly granted in writing by Quantum. Quantum reserves the right to have electronic communications, including email and attachments, sent across its networks filtered through anti virus and spam software programs and retain such messages in order to comply with applicable data security and retention requirements. Quantum is not responsible for the proper and complete transmission of the substance of this communication or for any delay in its receipt.
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