Source code for sertit.snap

# -*- coding: utf-8 -*-
# Copyright 2022, SERTIT-ICube - France,
# This file is part of sertit-utils project
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.
SNAP tools
import logging
import os

import psutil

from sertit import misc, strings
from sertit.logs import SU_NAME

MAX_CORES = os.cpu_count() - 2
MAX_MEM = int(os.environ.get("JAVA_OPTS_XMX", 0.95 * psutil.virtual_memory().total))
TILE_SIZE = 2048
LOGGER = logging.getLogger(SU_NAME)

[docs]def bytes2snap(nof_bytes: int) -> str: """ Convert nof bytes into snap-compatible Java options. .. code-block:: python >>> bytes2snap(32000) '31K' Args: nof_bytes (int): Byte nb Returns: str: Human-readable in bits """ symbols = ("K", "M", "G", "T", "P", "E", "Z", "Y") prefix = {} for idx, sym in enumerate(symbols): prefix[sym] = 1 << (idx + 1) * 10 for sym in reversed(symbols): if nof_bytes >= prefix[sym]: value = int(float(nof_bytes) / prefix[sym]) return "%s%s" % (value, sym) return "%sB" % nof_bytes
[docs]def get_gpt_cli( graph_path: str, other_args: list, display_snap_opt: bool = False ) -> list: """ Get GPT command line with system OK optimizations. To see options, type this command line with --diag (but it won't run the graph) .. code-block:: python >>> get_gpt_cli("graph_path", other_args=[], display_snap_opt=True) SNAP Release version 8.0 SNAP home: C:/Program Files/snap/bin/.. SNAP debug: null SNAP log level: WARNING Java home: c:/program files/snap/jre/jre Java version: 1.8.0_242 Processors: 16 Max memory: 53.3 GB Cache size: 30.0 GB Tile parallelism: 14 Tile size: 2048 x 2048 pixels To configure your gpt memory usage: Edit snap/bin/gpt.vmoptions To configure your gpt cache size and parallelism: Edit .snap/etc/ or gpt -c ${cachesize-in-GB}G -q ${parallelism} ['gpt', '"graph_path"', '-q', 14, '-J-Xms2G -J-Xmx60G', '-J-Dsnap.log.level=WARNING', '-J-Dsnap.jai.defaultTileSize=2048', '-J-Dsnap.dataio.reader.tileWidth=2048', '-J-Dsnap.dataio.reader.tileHeigh=2048', '-J-Dsnap.jai.prefetchTiles=true', '-c 30G'] Args: graph_path (str): Graph path other_args (list): Other args as a list such as :code:`['-Pfile="", '-Pout="out_file.dim"']` display_snap_opt (bool): Display SNAP options via --diag Returns: list: GPT command line as a list """ gpt_cli = [ "gpt", strings.to_cmd_string(graph_path), "-q", MAX_CORES, # Maximum parallelism f"-J-Xms2G -J-Xmx{bytes2snap(MAX_MEM)}", # Initially/max allocated memory "-J-Dsnap.log.level=WARNING", f"-J-Dsnap.jai.defaultTileSize={TILE_SIZE}", f"-J-Dsnap.dataio.reader.tileWidth={TILE_SIZE}", f"-J-Dsnap.dataio.reader.tileHeight={TILE_SIZE}", "-J-Dsnap.jai.prefetchTiles=true", f"-c {bytes2snap(int(0.5 * MAX_MEM))}", # Tile cache set to 50% of max memory (up to 75%) # '-x', *other_args, ] # Clears the internal tile cache after writing a complete row to the target file # LOGs LOGGER.debug(gpt_cli) if display_snap_opt: misc.run_cli(gpt_cli + ["--diag"]) return gpt_cli