bug: resource exhausted (Too many open files)

[Matt Solomon]

Full error is:

hevm: /usr/bin/security: createProcess: runInteractiveProcess: pipe: resource exhausted (Too many open files)

To reproduce, create a test file with the below content and run dapp test --rpc-url $ETH_RPC_URL. This test simulates a call to shutdown Convex, which is a large transaction that uses about 16M gas

pragma solidity ^0.8.6;

import "ds-test/test.sol";

interface Hevm {
  function store(address c, bytes32 loc, bytes32 val) external;
}

interface IConvex {
  function owner() external view returns (address);
  function shutdownSystem() external;
}

contract ConvexTest is DSTest {
  Hevm constant hevm = Hevm(address(uint160(uint256(keccak256('hevm cheat code')))));
  IConvex convex = IConvex(0xF403C135812408BFbE8713b5A23a04b3D48AAE31);

  function testShutdownCost() public {
    hevm.store(address(convex), bytes32(uint256(4)), bytes32(uint256(uint160(address(this)))));
    assertEq(convex.owner(), address(this));

    uint256 _startGas = gasleft();
    convex.shutdownSystem();
    emit log_named_uint("shutdown gas used", _startGas - gasleft());
  }
}

[Matt Solomon]

Created a repo with this code here: https://github.com/mds1/convex-shutdown-simulation

[Matt Solomon]

This also seems to only happen on macOS, as it works on linux

[sam bacha]

running on MacOS 10.15.7 (19H2)

$ ./scripts/benchmark-foundry.sh
compiling...
no files changed, compilation skippped.
Running 1 test for "ConvexTest.json":ConvexTest
[PASS] testShutdownCost() (gas: 18876589)

real	6m52.588s
user	0m1.586s
sys	0m0.462s

$ ulimit -a
core file size              (blocks, -c) 0
data seg size               (kbytes, -d) unlimited
file size                   (blocks, -f) unlimited
max locked memory           (kbytes, -l) unlimited
max memory size             (kbytes, -m) unlimited
open files                          (-n) 8192
pipe size                (512 bytes, -p) 1
stack size                  (kbytes, -s) 8192
cpu time                   (seconds, -t) unlimited
max user processes                  (-u) 5568
virtual memory              (kbytes, -v) unlimited

Edit: only included the foundry run, here is the dapptools results

$ ./scripts/benchmark-dapptools.sh
dapp-test: rpc block: 13724056
Running 1 tests for src/Convex.t.sol:ConvexTest
[PASS] testShutdownCost() (gas: 16779553)


real	27m8.004s
user	12m4.388s
sys	5m24.722s

[dxo]

Are you still able to reproduce @mds1 ?

[Matt Solomon]

Apparently not! Just updated dapptools to the latest master, and ran make benchmark-dapptools in the linked repo twice, and it worked both times

$ make benchmark-dapptools
bash scripts/benchmark-dapptools.sh
dapp-test: rpc block: 13724056
Running 1 tests for src/Convex.t.sol:ConvexTest
[PASS] testShutdownCost() (gas: 16779553)


real    5m16.308s
user    10m22.356s
sys     5m34.274s