anirudh2290 commented on a change in pull request #13324: Fix/env disable 
mkldnn cache map
URL: https://github.com/apache/incubator-mxnet/pull/13324#discussion_r234838336
 
 

 ##########
 File path: docs/faq/env_var.md
 ##########
 @@ -195,6 +195,10 @@ When USE_PROFILER is enabled in Makefile or CMake, the 
following environments ca
   - Values: 0, 1 ```(default=1)```
   - Flag to enable or disable MKLDNN accelerator. On by default.
   - Only applies to mxnet that has been compiled with MKLDNN (```pip install 
mxnet-mkl``` or built from source with ```USE_MKLDNN=1```)
+  
+* MXNET_MKLDNN_CACHE_SIZE
+  - Values: Int ```(default=-1)```
+  - Flag to set MKLDNN cache size. Default is -1 which means cache size is 
unbounded. Should only be set if your model has variable input shapes, as cache 
size may grow unbounded.
 
 Review comment:
   can you address the comment from 
https://github.com/apache/incubator-mxnet/pull/12746

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