Improves transcoding performance and memory usage

Configures OpenImageIO (OIIO) to use a percentage of available memory as a cache.
This improves transcoding performance by reducing disk I/O. Also, this change adds
the 'psutil' package as a dependency to gather system memory information. It also
enables multithreading in OIIO to further enhance performance.

client/ayon_core/lib/transcoding.py

@@ -6,6 +6,7 @@ import collections
 import tempfile
 import subprocess
 import platform
+import psutil
 from typing import Optional
 
 import xml.etree.ElementTree
@@ -1009,12 +1010,19 @@ def convert_colorspace(
     # Collect channels to export
     input_arg, channels_arg = get_oiio_input_and_channel_args(input_info)
 
+    # Prepare subprocess arguments
+    # Use 50% of available memory for cache (in bytes)
+    available_memory = psutil.virtual_memory().available
+    cache_size = int(available_memory * 0.5)
+
     # Prepare subprocess arguments
     oiio_cmd = get_oiio_tool_args(
         "oiiotool",
         # Don't add any additional attributes
         "--nosoftwareattrib",
-        "--colorconfig", config_path
+        "--threads", str(os.cpu_count()),
+        "--cache",  str(cache_size),
+        "--colorconfig", config_path,
     )
 
     oiio_cmd.extend([

client/pyproject.toml

@@ -9,6 +9,7 @@ jsonschema = "^2.6.0"
 pyblish-base = "^1.8.11"
 speedcopy = "^2.1"
 six = "^1.15"
+psutil = "^5.9.0"
 qtawesome = "0.7.3"
 
 [ayon.runtimeDependencies]