Add DMLC_PS_VAN_TYPE to env_var.md (#153)

* Update env.md * Update env.md
dmlc · Oct 13, 2019 · 411c9bb · 411c9bb
1 parent 60b826e
commit 411c9bb
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diff --git a/docs/env.md b/docs/env.md
@@ -13,3 +13,4 @@ additional variables:
 - `DMLC_INTERFACE` : the network interface a node should use. in default choose
   automatically
 - `DMLC_LOCAL` : runs in local machines, no network is needed
+- `DMLC_PS_VAN_TYPE` : the type of the Van for transport, can be `ibverbs` for RDMA, `zmq` for TCP