# Configuring processing and parallelism
The following environment variables control job and file processing.
## Configuring the number of jobs to run concurrently
The number of jobs that can run concurrently can affect the [number of Textual workers](https://docs.tonic.ai/textual/textual-install-administer/configuring-textual/general-instance-and-processing-settings/textual-config-ml-worker-count) that you need. The more jobs that can run concurrently, the fewer workers that are needed.
Textual provides a set of environment variables to control the number of jobs that each Textual worker can run at the same time.
* A global setting to control the total number of jobs across all job types.
* Individual settings to control the number of concurrent jobs for specific job types.
### Configuring the global limit for concurrent jobs
The environment variable `SOLAR_MAX_CONCURRENT_WORKER_JOBS` controls the number of jobs that can run concurrently across all of the job types.
The default value is 16.
### Configuring the limits for specific job types
The following environment variables control the number of jobs that can run concurrently for specific types of jobs.
* `SOLAR_MAX_CONCURRENT_JOBS_DEIDENTIFY_FILE` \
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Default value: 8\
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Includes the following actions:
* Upload a file to a dataset
* Rescan a dataset file that fails to process
* Rescan a dataset file after a custom entity type is created or edited
* Rescan a dataset file after an update to the dataset configuration
* Textual uploads a cloud storage file for processing
* `SOLAR_MAX_CONCURRENT_JOBS_DEIDENTIFY_UNATTACHED_FILE` \
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Default value: 8\
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Includes the following actions:
* Upload a file to the **Home** page preview tool
* In the SDK, make a call to `redact.start_file_redaction`
* `SOLAR_MAX_CONCURRENT_JOBS_PARSE_FILES` \
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Default value: 8\
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Includes the following actions:
* Run parsing jobs
* `SOLAR_MAX_CONCURRENT_JOBS_AUDIO_TRANSCRIPTION` \
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Default value: 8\
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Includes the following actions:
* Transcribe and redact an audio file
* `SOLAR_MAX_CONCURRENT_JOBS_PROCESS_EXTERNAL_FILES` \
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Default value: 8\
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Includes the following actions:
* Synchronize cloud storage files for a dataset
* `SOLAR_MAX_CONCURRENT_JOBS_GENERATE_EXTERNAL_FILES` \
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Default value: 8\
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Includes the following actions:
* Generate output files for a cloud storage dataset
* `SOLAR_MAX_CONCURRENT_JOBS_MANUAL_REDACTION_PROCESS_FILE`\
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Default value: 8\
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Includes the following actions:
* Scan a file in a guided redaction project
* `SOLAR_MAX_CONCURRENT_JOBS_FILE_ANNOTATION` \
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Default value: 5\
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Includes the following actions:
* For a model-based custom entity type, identify the entity type values in the test data.
* `SOLAR_MAX_CONCURRENT_JOBS_GENERATE_NEW_GUIDELINES` \
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Default value: 2\
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Includes the following actions:
* For a model-based custom entity type, generate recommendations to improve the guidelines.
* `SOLAR_MAX_CONCURRENT_JOBS_TRAINING_FILE_ANALYSIS` \
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Default value: 4\
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Includes the following actions:
* For a model-based custom entity type, analyze the training files.
* `SOLAR_MAX_CONCURRENT_JOBS_TRAINING_FILE_ANNOTATION` \
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Default value: 4\
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Includes the following actions:
* For a model-based custom entity type, use the selected guidelines version to identify the entity values in the training data.
## Configuring the size of the datetime generator cache
When it generates datetime values, to optimize the processing, Textual stores the redacted datetime values in a cache.
To change the cache size, configure the environment variable `SOLAR_DATETIME_GENERATOR_CACHE_CAPACITY`.
The default value is 100000, meaning that the cache contains 100,000 values.
Note that while increasing the size of the cache can speed up processing, it also uses more RAM.
## Configuring the number of PDF pages to redact simultaneously
When Textual redacts PDF files so that a user can preview or download the output, the following environment variable determines the number of pages that it processes simultaneously:
`SOLAR_PDF_PAGE_REDACTION_PARALLELISM`
The default value is 4, meaning that Textual processes 4 pages at a time.
## Configuring the number of PDF files to plan simultaneously
When Textual plans the redaction of PDF files for a user to preview or download, the following environment variable determines the number of files that it plans simultaneously.
`SOLAR_PDF_DOC_PLAN_PARALLELISM`
The default value is 3, meaning that Textual plans 3 PDF files at a time.
## Configuring how often to purge cached PDF pages
When it redacts PDF files, Textual stores the redacted PDF pages in a cache.
The following environment variable determines how often Textual purges the cache of PDF pages.
`PURGE_REDACTED_PAGES_IN_HOURS`
The default value is 12, meaning that Textual purges the redacted PDF pages cache every 12 hours.
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