# Extreme large RAM usage on tdvp

**URL:** <https://itensor.discourse.group/t/extreme-large-ram-usage-on-tdvp/1954>\
**Category:** ITensor Julia Questions\
**Created:** [September 3, 2024, 6:29am UTC](https://itensor.discourse.group/t/extreme-large-ram-usage-on-tdvp/1954 "2024-09-03T06:29:38Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Shengtao](https://avatars.discourse-cdn.com/v4/letter/s/b19c9b/32.png) [@Shengtao](https://itensor.discourse.group/u/Shengtao)\
**Post date:** [September 3, 2024, 8:02pm UTC](https://itensor.discourse.group/t/extreme-large-ram-usage-on-tdvp/1954/5 "2024-09-03T20:02:20Z")

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Julia has an internal function recording the peak memory calld `Sys.maxrss()`. I learned it from this post: [https://itensor.discourse.group/t/memory-usage-in-dmrg-with-julia-1-x/1092](https://itensor.discourse.group/t/memory-usage-in-dmrg-with-julia-1-x/1092) . You can do something like `@printf "Max. RSS: %9.3f GB\n" Sys.maxrss()/2^30`. A more deatiled discussion is in [How to track total memory usage of Julia process over time](https://discourse.julialang.org/t/how-to-track-total-memory-usage-of-julia-process-over-time/91167/6).

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