Look at the top and htop commands and how to use them to get memory usage information.
- [Instructor] Let's look at our memleak.c file,…and we see it loops 30 times, mallocing 100 meg each time,…with a sleep in between, so it's going to run…something over 30 seconds.…And we're going to run that, and while it's running,…we're going to look at top and htop.…And to make sure we have enough time,…I'm just going to run it in a loop.…So while true do memleak done.…
All right, so that's running in this window.…I'll switch over to another window and I'll run top,…and top is now sorting by percent CPU…and memleak doesn't seem to be using a lot of CPU there.…So we're going to switch to percent memory so we do a little f…and we get the list, down arrow brings us brings us…to percent mem, and if you read the little list…on top of directions we see we need to do a right arrow…to select, then a left arrow to commit,…than as S to say we want to sort on that,…and then an escape.…
Now we're sorting on percent mem…and memleak's way up there at the top,…using over 30%.…And then memleak went away, we got a new memleak,…
Author
Released
2/15/2018- Timing techniques
- Packages for performance
- Identifying and optimizing CPU bottlenecks
- Finding memory bottlenecks
- Diagnosing disk bottlenecks
Skill Level Advanced
Duration
Views
Related Courses
-
DevOps Foundations
with Ernest Mueller2h 47m Beginner -
Linux: Web Services
with Scott Simpson1h 18m Intermediate
-
Introduction
-
Welcome32s
-
-
1. Performance Overview
-
Timing techniques14m 16s
-
Timing techniques solution3m 21s
-
The proc filesystem7m 58s
-
Packages for performance6m 8s
-
Performance Co-Pilot and Tuna10m 23s
-
2. CPU Bottlenecks
-
top for CPU usage1m 43s
-
sar for CPU2m 59s
-
/proc/cpuinfo2m 18s
-
Throughput vs. response time4m 17s
-
-
3. Memory Bottlenecks
-
What is a memory leak?6m 53s
-
CPU caches and page caches12m 43s
-
Page sizes and page faults11m 17s
-
-
4. Disk Bottlenecks
-
Hard disks and SSD behavior7m 21s
-
Filesystem types and performance10m 16s
-
Solution: Disk bottlenecks3m 49s
-
-
Conclusion
-
Next steps40s
-
- Mark as unwatched
- Mark all as unwatched
Are you sure you want to mark all the videos in this course as unwatched?
This will not affect your course history, your reports, or your certificates of completion for this course.
CancelTake notes with your new membership!
Type in the entry box, then click Enter to save your note.
1:30Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.
Share this video
Embed this video
Video: top and htop for memory usage