Mixing
Return LTTng timestamp as an event field
0
I'm new at tracing, and I'm mostly interested on its usage for getting execution times.
I was wondering if it's possible to return the timestamp on when a trace was generated as a return value (such as an ID or any custom value), instead of fetching it from the event header.
Thanks for your help!
lttng
asked Nov 19 '18 at 15:34
JMC
1
add a comment |
0
I'm new at tracing, and I'm mostly interested on its usage for getting execution times.
I was wondering if it's possible to return the timestamp on when a trace was generated as a return value (such as an ID or any custom value), instead of fetching it from the event header.
Thanks for your help!
lttng
asked Nov 19 '18 at 15:34
JMC
1
Can you clarify what you are trying to achieve? You want the execution time of what exactly? Are you tracing Userspace or Kernelspace? You say you want the timestamp "as a return value", what do you mean by that? Cheers!
– fdeslaur
Nov 24 '18 at 20:37
What I try to get is the timestamp on when the trace was generated as an event field, so I can directly get that information from there and not from the event header. I need timestamps in order to make an average of a programs' execution time. Also I was wondering if it's possible to generate all traces in the same trace file, since I get one file per core (channel_0, channel_1, ...). Cheers!
– JMC
Nov 27 '18 at 19:09
Are you trying to read the trace files directly? You should use Babeltrace to read the timestamps of your events. Even better, use the Python Bindings: lttng.org/docs/v2.10/… to write a script to compute your averages. Babeltrace will compute the timestamps for you so you don't have to care about the event header. Also Babeltrace will reorder the events (from all channel_X)
– fdeslaur
Nov 29 '18 at 16:56
add a comment |
0
0
0
I'm new at tracing, and I'm mostly interested on its usage for getting execution times.
I was wondering if it's possible to return the timestamp on when a trace was generated as a return value (such as an ID or any custom value), instead of fetching it from the event header.
Thanks for your help!
lttng
asked Nov 19 '18 at 15:34
JMC
1
I'm new at tracing, and I'm mostly interested on its usage for getting execution times.
I was wondering if it's possible to return the timestamp on when a trace was generated as a return value (such as an ID or any custom value), instead of fetching it from the event header.
Thanks for your help!
lttng
lttng
asked Nov 19 '18 at 15:34
JMC
1
asked Nov 19 '18 at 15:34
JMC
1
asked Nov 19 '18 at 15:34
JMC
1
asked Nov 19 '18 at 15:34
JMC
1
asked Nov 19 '18 at 15:34
JMC
1
1
Can you clarify what you are trying to achieve? You want the execution time of what exactly? Are you tracing Userspace or Kernelspace? You say you want the timestamp "as a return value", what do you mean by that? Cheers!
– fdeslaur
Nov 24 '18 at 20:37
What I try to get is the timestamp on when the trace was generated as an event field, so I can directly get that information from there and not from the event header. I need timestamps in order to make an average of a programs' execution time. Also I was wondering if it's possible to generate all traces in the same trace file, since I get one file per core (channel_0, channel_1, ...). Cheers!
– JMC
Nov 27 '18 at 19:09
Are you trying to read the trace files directly? You should use Babeltrace to read the timestamps of your events. Even better, use the Python Bindings: lttng.org/docs/v2.10/… to write a script to compute your averages. Babeltrace will compute the timestamps for you so you don't have to care about the event header. Also Babeltrace will reorder the events (from all channel_X)
– fdeslaur
Nov 29 '18 at 16:56
add a comment |
Can you clarify what you are trying to achieve? You want the execution time of what exactly? Are you tracing Userspace or Kernelspace? You say you want the timestamp "as a return value", what do you mean by that? Cheers!
– fdeslaur
Nov 24 '18 at 20:37
What I try to get is the timestamp on when the trace was generated as an event field, so I can directly get that information from there and not from the event header. I need timestamps in order to make an average of a programs' execution time. Also I was wondering if it's possible to generate all traces in the same trace file, since I get one file per core (channel_0, channel_1, ...). Cheers!
– JMC
Nov 27 '18 at 19:09
Are you trying to read the trace files directly? You should use Babeltrace to read the timestamps of your events. Even better, use the Python Bindings: lttng.org/docs/v2.10/… to write a script to compute your averages. Babeltrace will compute the timestamps for you so you don't have to care about the event header. Also Babeltrace will reorder the events (from all channel_X)
– fdeslaur
Nov 29 '18 at 16:56
Can you clarify what you are trying to achieve? You want the execution time of what exactly? Are you tracing Userspace or Kernelspace? You say you want the timestamp "as a return value", what do you mean by that? Cheers!
– fdeslaur
Nov 24 '18 at 20:37
Can you clarify what you are trying to achieve? You want the execution time of what exactly? Are you tracing Userspace or Kernelspace? You say you want the timestamp "as a return value", what do you mean by that? Cheers!
– fdeslaur
Nov 24 '18 at 20:37
What I try to get is the timestamp on when the trace was generated as an event field, so I can directly get that information from there and not from the event header. I need timestamps in order to make an average of a programs' execution time. Also I was wondering if it's possible to generate all traces in the same trace file, since I get one file per core (channel_0, channel_1, ...). Cheers!
– JMC
Nov 27 '18 at 19:09
What I try to get is the timestamp on when the trace was generated as an event field, so I can directly get that information from there and not from the event header. I need timestamps in order to make an average of a programs' execution time. Also I was wondering if it's possible to generate all traces in the same trace file, since I get one file per core (channel_0, channel_1, ...). Cheers!
– JMC
Nov 27 '18 at 19:09
Are you trying to read the trace files directly? You should use Babeltrace to read the timestamps of your events. Even better, use the Python Bindings: lttng.org/docs/v2.10/… to write a script to compute your averages. Babeltrace will compute the timestamps for you so you don't have to care about the event header. Also Babeltrace will reorder the events (from all channel_X)
– fdeslaur
Nov 29 '18 at 16:56
Are you trying to read the trace files directly? You should use Babeltrace to read the timestamps of your events. Even better, use the Python Bindings: lttng.org/docs/v2.10/… to write a script to compute your averages. Babeltrace will compute the timestamps for you so you don't have to care about the event header. Also Babeltrace will reorder the events (from all channel_X)
– fdeslaur
Nov 29 '18 at 16:56
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53377951%2freturn-lttng-timestamp-as-an-event-field%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53377951%2freturn-lttng-timestamp-as-an-event-field%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Can you clarify what you are trying to achieve? You want the execution time of what exactly? Are you tracing Userspace or Kernelspace? You say you want the timestamp "as a return value", what do you mean by that? Cheers!
– fdeslaur
Nov 24 '18 at 20:37
What I try to get is the timestamp on when the trace was generated as an event field, so I can directly get that information from there and not from the event header. I need timestamps in order to make an average of a programs' execution time. Also I was wondering if it's possible to generate all traces in the same trace file, since I get one file per core (channel_0, channel_1, ...). Cheers!
– JMC
Nov 27 '18 at 19:09
Are you trying to read the trace files directly? You should use Babeltrace to read the timestamps of your events. Even better, use the Python Bindings: lttng.org/docs/v2.10/… to write a script to compute your averages. Babeltrace will compute the timestamps for you so you don't have to care about the event header. Also Babeltrace will reorder the events (from all channel_X)
– fdeslaur
Nov 29 '18 at 16:56