9073f7591e
When trying to upload volume to glance as image, currently all the format transformation is done by software and the performance is not good. Leverage hardware accelerator to do the image compression, so as to offload CPU, release CPU to do more common and complex thing. Professional hardware accelerator will get better performance and shorter conversion time than software solution. Currently hardware accelerator is getting more popular and some are integrated in server chipset by default. This patch includes: 1. Uses the new image container_format 'compressed' introduced by Glance in the Train release 2. Implemented a simple framework: if there's an accelerator detected in system, then try to use it 3. Supported Intel QAT as one of the accelerator 4. Add command filter for command 'qzip' and 'gzip' in rootwrap 5. New configuration option 'allow_compression_on_image_upload' and 'compression_format' added 6. Releasenote added Change-Id: I8460f58d2ad95a6654cf4d6a6bb367f3c537536b Implements: blueprint leverage-compression-accelerator Signed-off-by: Liang Fang <liang.a.fang@intel.com>
100 lines
4.0 KiB
Python
100 lines
4.0 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_concurrency import processutils
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from oslo_log import log as logging
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from cinder import exception
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from cinder.i18n import _
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from cinder.image import accelerator
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from cinder import utils
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LOG = logging.getLogger(__name__)
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class AccelQAT(accelerator.AccelBase):
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def is_accel_exist(self):
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cmd = ['which', 'qzip']
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try:
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utils.execute(*cmd)
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except processutils.ProcessExecutionError:
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LOG.error("QATzip package is not installed.")
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return False
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return True
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# NOTE(ZhengMa): QATzip compresses a file in-place and adds a .gz
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# extension to the filename, so we rename the compressed file back
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# to the name Cinder expects it to have.
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# (Cinder expects to have A to upload)
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# Follow these steps:
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# 1. compress A to A.gz (src to qat_out_file)
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# 2. mv A.gz to A (qat_out_file to dest)
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def compress_img(self, src, dest, run_as_root):
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try:
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qat_compress_cmd = ['qzip', '-k', src, '-o', dest]
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utils.execute(*qat_compress_cmd, run_as_root=run_as_root)
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except processutils.ProcessExecutionError as ex:
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raise exception.CinderAcceleratorError(
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accelerator='QAT',
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description=_("Volume compression failed while "
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"uploading to glance. QAT compression "
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"command failed."),
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cmd=qat_compress_cmd,
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reason=ex.stderr)
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try:
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qat_output_filename = src + '.gz'
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mv_cmd = ['mv', qat_output_filename, dest]
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utils.execute(*mv_cmd, run_as_root=run_as_root)
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except processutils.ProcessExecutionError as ex:
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fnames = {'i_fname': qat_output_filename, 'o_fname': dest}
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raise exception.CinderAcceleratorError(
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accelerator='QAT',
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description = _("Failed to rename %(i_fname)s "
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"to %(o_fname)s") % fnames,
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cmd=mv_cmd,
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reason=ex.stderr)
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# NOTE(ZhengMa): QATzip can only decompresses a file with a .gz
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# extension to the filename, so we rename the original file so
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# that it can be accepted by QATzip.
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# Follow these steps:
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# 1. mv A to A.gz (qat_in_file is A.gz)
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# 2. decompress A.gz to A (qat_in_file to dest)
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def decompress_img(self, src, dest, run_as_root):
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try:
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qat_input_filename = dest + '.gz'
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mv_cmd = ['mv', src, qat_input_filename]
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utils.execute(*mv_cmd, run_as_root=run_as_root)
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except processutils.ProcessExecutionError as ex:
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fnames = {'i_fname': src, 'o_fname': qat_input_filename}
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raise exception.CinderAcceleratorError(
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accelerator='QAT',
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description = _("Failed to rename %(i_fname)s "
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"to %(o_fname)s") % fnames,
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cmd=mv_cmd,
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reason=ex.stderr)
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try:
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qat_decompress_cmd = ['qzip', '-d', qat_input_filename]
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utils.execute(*qat_decompress_cmd, run_as_root=run_as_root)
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except processutils.ProcessExecutionError as ex:
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raise exception.CinderAcceleratorError(
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accelerator='QAT',
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description = _("Image decompression failed while "
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"downloading from glance. QAT "
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"decompression command failed."),
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cmd=qat_decompress_cmd,
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reason=ex.stderr)
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