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# MSTAT
Record the memory usage of a process over time.
## Installation
- **Requires**
- Linux
- `make`
- `cmake` (>= v3.x)
- `gcc` or `clang` (C99 compiler)
- `gnuplot` (optional)
```shell
git clone https://github.com/jhunkeler/mstat && cd mstat
cmake -DCMAKE_INSTALL_PREFIX=/usr/local .
make
make install
```
# How to use MSTAT
```text
usage: mstat [OPTIONS] [-p PID] | {PROGRAM... ARGS}
-c clobber 'PID#.mstat' if it exists
-h this help message
-o DIR path to output directory (must exist)
-p PID process id to monitor
-s RATE samples per second (default: 1.00)
-v increased verbosity
```
## Monitor an existing process
```shell
$ mstat -p 12345
PID: 12345
Samples per second: 1.00
(interrupt with ctrl-c...)
```
## Monitor a new process
```shell
$ mstat -s 10000 free
PID: 12345
Samples per second: 10000.00
(interrupt with ctrl-c...)
total used free shared buff/cache available
Mem: 28455904 8951836 10728332 476032 8775736 18596172
Swap: 16777212 0 16777212
pid 148257 returned 0
data written: 12345.mstat
```
## Plotting
Requires `gnuplot` to be installed.
- Debian / Ubuntu
- `apt update && apt install gnuplot`
- Fedora / RHEL
- `yum install gnuplot`
- Arch Linux
- `pacman -S gnuplot`
```text
usage: mstat_plot [OPTIONS] {FILE}
-f NAME[,...] mstat field(s) to plot (default: rss,pss,swap)
-h this help message
-l list mstat fields
-v verbose mode
```
### Render
```shell
$ mstat_plot 12345.mstat
```
## CSV export
```shell
$ mstat_export 12345.mstat > 12345.csv
```
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