Issues with mcd-cdp ls with a large number of urns

[EdNoepel]

When ~1000 urns are open, mcd -C testnet cdp ls fails with an Argument list too long error. It's also worth mentioning it required 1000000 gas just to get that error. I'd hope that the required amount of gas wouldn't keep increasing as more CDPs are opened.

[gbalabasquer]

I understand the Argument list too long issue but what does the cdp listing has to do with the gas amount? There is not even a transaction there.

[EdNoepel]

Are you sure about that?

(_virtualenv) ed@duckmaker:~/Projects/auction-keeper/tests/manual$ mcd -C testnet cdp ls --gas=1
seth-rpc: {"id":1,"jsonrpc":"2.0","method":"eth_call","params":[{"data":"0xc455279100000000000000000000000000a329c0648769a73afac7f9381e0
8fb43dbea72","from":"0x00a329c0648769A73afAc7F9381E08FB43dBEA72","gas":"0x1","to":"0xcd9a70C13C88863ECE51B302a77D2EB98fBBBD65"},"latest"
]}
seth-rpc: error:   code       -32015
seth-rpc: error:   data       NotEnoughBaseGas { required: 22616, got: 1 }
seth-rpc: error:   message    Transaction execution error.

[gbalabasquer]

It is using the support contract to get the CDPs list. I guess that last error has to do with you forcing 1 gas.
You could try manually with this:
seth call "$GET_CDPS" "getCdpsDesc(address,address)" "$CDP_MANAGER" "$YOUR_PROXY_ADDR" without specifying any amount of gas, and previously having executed unset ETH_GAS).

Anyway I don't think it will be normal 1 address has so many CDPs.