# uftrace

### Get utility

{% code title="Ubuntu X86\_64" %}

```bash
sudo apt install uftrace
```

{% endcode %}

{% code title="ARM64 in Yocto" %}

```bash
IMAGE_INSTALL_append = " uftrace"
```

{% endcode %}

{% code title="app.c" %}

```c
#include<stdio.h>

int main(void) {
        printf("This is app\n");
        sample_lib();
        return 0;
}
```

{% endcode %}

{% code title="sample lib.c" %}

```c
#include <stdio.h>
#include <time.h>

void sample_lib(void) {
        sleep(10);
        printf("Inside Library\n");
}
```

{% endcode %}

```bash
// Compiling library dynamically
gcc -fpic -shared -pg sample.c -o libsample.so

// compile app
gcc -pg app.c libsample.so -o app
```

{% hint style="info" %}
"-pg" option should be used for compiling app/libraries
{% endhint %}

```bash
export LD_LIBRARY_PATH=<path to so>
# execute app using uftrace
uftrace record ./app
```

```c
uftrace replay
# DURATION     TID     FUNCTION
            [645920] | main() {
  19.924 us [645920] |   puts();
            [645920] |   sample_lib() {
  10.000  s [645920] |     sample_lib();
  10.000  s [645920] |   } /* sample_lib */
  10.000  s [645920] | } /* main */

```

```c
 uftrace graph
# Function Call Graph for 'a.out' (session: e29b6ce8fa6d7e63)
========== FUNCTION CALL GRAPH ==========
# TOTAL TIME   FUNCTION
   10.000  s : (1) a.out
   10.000  s : (1) main
   19.924 us :  +-(1) puts
             :  |
   10.000  s :  +-(1) sample_lib
   10.000  s :    (1) sample_lib

```

#### TBD

* Live C programming&#x20;
* Display each line while executing ( similar to -x in bash )