Summary:
Results are:
```
I0327 12:22:56.312857 13756] Testing with 1 threads and 100000 transactions per thread...
I0327 12:22:56.337549 13756] Result (millions of transactions per second) 4.07272
I0327 12:22:56.337618 13756] Testing with 2 threads and 100000 transactions per thread...
I0327 12:22:56.449129 13756] Result (millions of transactions per second) 1.79392
I0327 12:22:56.449151 13756] Testing with 4 threads and 100000 transactions per thread...
I0327 12:22:56.821496 13756] Result (millions of transactions per second) 1.07434
I0327 12:22:56.821519 13756] Testing with 8 threads and 100000 transactions per thread...
I0327 12:22:58.265359 13756] Result (millions of transactions per second) 0.554081
I0327 12:22:58.265383 13756] Testing with 16 threads and 100000 transactions per thread...
I0327 12:23:03.978154 13756] Result (millions of transactions per second) 0.280075
```
After changing the lock to `std::mutex`:
```
I0327 12:28:47.493680 14755] Testing with 1 threads and 100000 transactions per thread...
I0327 12:28:47.520134 14755] Result (millions of transactions per second) 3.80314
I0327 12:28:47.520270 14755] Testing with 2 threads and 100000 transactions per thread...
I0327 12:28:47.744608 14755] Result (millions of transactions per second) 0.891592
I0327 12:28:47.744639 14755] Testing with 4 threads and 100000 transactions per thread...
I0327 12:28:48.213151 14755] Result (millions of transactions per second) 0.853791
I0327 12:28:48.213181 14755] Testing with 8 threads and 100000 transactions per thread...
I0327 12:28:49.342561 14755] Result (millions of transactions per second) 0.70836
I0327 12:28:49.342594 14755] Testing with 16 threads and 100000 transactions per thread...
I0327 12:28:51.722991 14755] Result (millions of transactions per second) 0.672164
```
Reviewers: dgleich
Reviewed By: dgleich
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D1319
