memory leaks on large websites

Hi support,

we receive errors like:
[08-Sep-2020 03:02:28] Starting upload to S3 Service …
[08-Sep-2020 03:03:25] ERROR: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 5242912 bytes)
[08-Sep-2020 03:03:25] 2. Trying to send backup file to S3 Service …
[08-Sep-2020 03:03:25] Connected to S3 Bucket “infamia-client-backups” in us-east-1
[08-Sep-2020 03:03:25] Starting upload to S3 Service …

our dev team did investigate and found the problem with memory leaks at AWS library

to fix the issue need to add at the file /backwpup/inc/class-destination-s3.php

on loop function gc_collect_cycles(); for clean memory leaks

while ( ! feof( $file_handle ) ) {
$chunk_upload_start = microtime( true );
$part_data = fread( $file_handle, 1048576 * 5 ); //5MB Minimum part size
$part = $s3->uploadPart( array(
‘Bucket’ => $job_object->job[‘s3bucket’],
‘UploadId’ => $job_object->steps_data[$job_object->step_working ][‘UploadId’],
‘Key’ => $job_object->job[‘s3dir’] . $job_object->backup_file,
‘PartNumber’ => $job_object->steps_data[ $job_object->step_working ][‘Part’],
‘Body’ => $part_data,) );

$chunk_upload_time = microtime( true ) – $chunk_upload_start;
$job_object->substeps_done = $job_object->substeps_done + strlen( $part_data );
$job_object->steps_data[ $job_object->step_working ][‘Parts’][] = array(
‘ETag’ => $part->get( ‘ETag’ ),
‘PartNumber’ => $job_object->steps_data[ $job_object->step_working ][‘Part’],
);
$job_object->steps_data[ $job_object->step_working ][‘Part’] ++;
$time_remaining = $job_object->do_restart_time();
if ( $time_remaining < $chunk_upload_time ) {
$job_object->do_restart_time( true );
}
$job_object->update_working_data();
gc_collect_cycles();
}

here is the old discussion of this issue: https://github.com/aws/aws-sdk-php/issues/1572