| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0006469 | Rocky-Linux-8 | General | public | 2024-05-02 14:32 | 2024-05-02 14:32 |
| Reporter | Shreyans K | Assigned To | |||
| Priority | high | Severity | major | Reproducibility | always |
| Status | new | Resolution | open | ||
| Platform | x86_64 | OS | Rocky Linux | OS Version | 8 |
| Summary | 0006469: Inconsistent application RAM usage increase in Rocky Linux 8 compared to Centos 7 | ||||
| Description | I have a C++ application that basically downloads some text files over HTTP and processes them. For each file, I create a Reader object that allocates a byte array buffer of size 1 MB on initialization. For this experiment's purpose, I have disabled all processing post these object creations. I am just creating one Reader object per file. What I have observed on Rocky Linux 8 is that after creating say N number of Reader objects for N files, the application RAM usage remains constant for a while (1-2 hours) and then starts increasing at a constant rate for about a day and then stabilizes. Please note that no processing is taking place after the creation of N objects. On CentOS 7 for the same experiment, the RAM usage remains constant after initialization of N objects as expected. I am attaching a screenshot of a graph of the app RAM usage depicting this same scenario. Note that in this, I am creating 400 Reader objects for 400 files on application start up. As can be seen, the app RAM usage remains constant at around 1 GB mark for about 1.5 hours and then starts increasing in steps of approximately 60 MB per 5 minutes. The duration of the graph is around 11 hours. Please help in making sense of this unexplained memory increase and how I can resolve this. Thanks! | ||||
| Additional Information | 1. No parallel processes are running on the system during this experiment 2. Values of some relevant sysctl parameters are as follows (All default Rocky 8 values): vm.dirty_background_bytes = 0 vm.dirty_background_ratio = 10 vm.dirty_bytes = 0 vm.dirty_expire_centisecs = 3000 vm.dirty_ratio = 40 vm.dirty_writeback_centisecs = 500 vm.dirtytime_expire_seconds = 43200 vm.memory_failure_early_kill = 0 vm.memory_failure_recovery = 1 vm.min_free_kbytes = 90112 vm.nr_hugepages = 0 vm.nr_hugepages_mempolicy = 0 vm.nr_overcommit_hugepages = 0 vm.numa_stat = 1 vm.overcommit_kbytes = 0 vm.overcommit_memory = 0 vm.overcommit_ratio = 50 vm.swappiness = 10 | ||||
| Tags | No tags attached. | ||||
- Anonymous
