Hello! I'm working on learning to use DTrace to profile NodeJS applications and have hit a wall that I'm hoping to get some additional insight on.
I have a NodeJS application that is sending an HTTP request to https://example.com every 5 seconds. This is working and getting a proper response. *I'm using the following DTrace script:* #pragma D option quiet node*:::http-client-request { printf("Connection to %s:%d on fd %d - Request %s: %s\n", args[1]->remoteAddress, args[1]->remotePort, args[1]->fd, args[0]->method, args[0]->url); } *Output:* [root@00-0c-29-ab-31-af /development]# dtrace -s ./test.d Connection to undefined:0 on fd 0 - Request GET: / Connection to undefined:0 on fd 0 - Request GET: / Connection to undefined:0 on fd 0 - Request GET: / It appears to me that all of the args[1] properties are not assigned and giving back default values (undefined or 0 depending on type). *The documentation for this probe lists the arguments:* 12437 node35247 node _ZN4node26DTRACE_HTTP_CLIENT_REQUESTERKN2v820FunctionCallbackInfoINS0_5ValueEEE http-client-request Probe Description Attributes Identifier Names: Private Data Semantics: Private Dependency Class: Unknown Argument Attributes Identifier Names: Evolving Data Semantics: Evolving Dependency Class: ISA Argument Types args[0]: node_http_request_t * args[1]: node_connection_t * args[2]: string args[3]: int args[4]: string args[5]: string args[6]: int The node_http_request_t struct properties appear to work, while the node_connection_t properties do not. I'm not sure where to go next in debugging this, or determining what I've misconfigured. This is running on a SmartOS VM, running NodeJS 8.4. Any insight, or a kick in the right direction would be greatly appreciated. Thanks! Brad Gardner ------------------------------------------- dtrace-discuss Archives: https://www.listbox.com/member/archive/184261/=now RSS Feed: https://www.listbox.com/member/archive/rss/184261/25769126-e243886f Modify Your Subscription: https://www.listbox.com/member/?member_id=25769126&id_secret=25769126-8d47a7b2 Powered by Listbox: http://www.listbox.com
