Update concurrency

Signed-off-by: Adrien <adrien@backslash.fr>

README.md

@@ -4,7 +4,9 @@
 
 ```
 docker build -t evm_toolbox .
-docker run -it --env PHX_HOST=localhost --env SECRET_KEY_BASE="F6DLslylCXON4ehdkPyzdrPxt3tiNuKvdTNpSa/tZMI2QvVvwuRXAwFVKBRyxRiS" -p 4000:4000 evm_toolbox
+docker run -it  --env MAX_CONCURRENCY=4 --env PHX_HOST=localhost --env SECRET_KEY_BASE="F6DLslylCXON4ehdkPyzdrPxt3tiNuKvdTNpSa/tZMI2QvVvwuRXAwFVKBRyxRiS" -p 4000:4000 evm_toolbox
 ```
 
-You can now access to the tool via "http://localhost:4000"
+You can now access to the tool via "http://localhost:4000"
+
+For `linux/arm64/v8` Arch you can directly `docker pull adrienmo/evm_toolbox`

lib/evm_toolbox/gas_analyzer.ex

@@ -23,18 +23,18 @@ defmodule EvmToolbox.GasAnalyzer do
 
   @spec do_analyze(String.t(), pid(), fun()) :: :ok
   def do_analyze(code, receiver, result_callback) do
-    path = create_project(code)
-
-    combinations = for version <- @versions, ir <- [true, false], do: {version, ir}
+    combinations = for ir <- [true, false], version <- @versions, do: {version, ir}
+    max_concurrency = System.get_env("MAX_CONCURRENCY", "1") |> String.to_integer()
 
     Task.async_stream(
       combinations,
       fn {version, ir} ->
+        path = create_project(code)
         {:ok, result} = analyze_version(version, ir, path)
         send(receiver, result_callback.({version, ir, result}))
       end,
       ordered: false,
-      max_concurrency: 4,
+      max_concurrency: max_concurrency,
       timeout: :infinity
     )
     |> Stream.run()