Table of Contents for
Squid: The Definitive Guide
Squid: The Definitive Guide
Published by
O'Reilly Media, Inc., 2004
- Cover
- Squid: The Definitive Guide
- Squid: The Definitive Guide
- Dedication
- Preface
- 1. Introduction
- 2. Getting Squid
- 3. Compiling and Installing
- 4. Configuration Guide for the Eager
- 5. Running Squid
- 6. All About Access Controls
- 7. Disk Cache Basics
- 8. Advanced Disk Cache Topics
- 9. Interception Caching
- 10. Talking to Other Squids
- 11. Redirectors
- 12. Authentication Helpers
- 13. Log Files
- 14. Monitoring Squid
- 15. Server Accelerator Mode
- 16. Debugging and Troubleshooting
- A. Config File Reference
- http_port
- https_port
- ssl_unclean_shutdown
- icp_port
- htcp_port
- mcast_groups
- udp_incoming_address
- udp_outgoing_address
- cache_peer
- cache_peer_domain
- neighbor_type_domain
- icp_query_timeout
- maximum_icp_query_timeout
- mcast_icp_query_timeout
- dead_peer_timeout
- hierarchy_stoplist
- no_cache
- cache_access_log
- cache_log
- cache_store_log
- cache_swap_log
- emulate_httpd_log
- log_ip_on_direct
- cache_dir
- cache_mem
- cache_swap_low
- cache_swap_high
- maximum_object_size
- minimum_object_size
- maximum_object_size_in_memory
- cache_replacement_policy
- memory_replacement_policy
- store_dir_select_algorithm
- mime_table
- ipcache_size
- ipcache_low
- ipcache_high
- fqdncache_size
- log_mime_hdrs
- useragent_log
- referer_log
- pid_filename
- debug_options
- log_fqdn
- client_netmask
- ftp_user
- ftp_list_width
- ftp_passive
- ftp_sanitycheck
- cache_dns_program
- dns_children
- dns_retransmit_interval
- dns_timeout
- dns_defnames
- dns_nameservers
- hosts_file
- diskd_program
- unlinkd_program
- pinger_program
- redirect_program
- redirect_children
- redirect_rewrites_host_header
- redirector_access
- redirector_bypass
- auth_param
- authenticate_ttl
- authenticate_cache_garbage_interval
- authenticate_ip_ttl
- external_acl_type
- wais_relay_host
- wais_relay_port
- request_header_max_size
- request_body_max_size
- refresh_pattern
- quick_abort_min
- quick_abort_max
- quick_abort_pct
- negative_ttl
- positive_dns_ttl
- negative_dns_ttl
- range_offset_limit
- connect_timeout
- peer_connect_timeout
- read_timeout
- request_timeout
- persistent_request_timeout
- client_lifetime
- half_closed_clients
- pconn_timeout
- ident_timeout
- shutdown_lifetime
- acl
- http_access
- http_reply_access
- icp_access
- miss_access
- cache_peer_access
- ident_lookup_access
- tcp_outgoing_tos
- tcp_outgoing_address
- reply_body_max_size
- cache_mgr
- cache_effective_user
- cache_effective_group
- visible_hostname
- unique_hostname
- hostname_aliases
- announce_period
- announce_host
- announce_file
- announce_port
- httpd_accel_host
- httpd_accel_port
- httpd_accel_single_host
- httpd_accel_with_proxy
- httpd_accel_uses_host_header
- dns_testnames
- logfile_rotate
- append_domain
- tcp_recv_bufsize
- err_html_text
- deny_info
- memory_pools
- memory_pools_limit
- forwarded_for
- log_icp_queries
- icp_hit_stale
- minimum_direct_hops
- minimum_direct_rtt
- cachemgr_passwd
- store_avg_object_size
- store_objects_per_bucket
- client_db
- netdb_low
- netdb_high
- netdb_ping_period
- query_icmp
- test_reachability
- buffered_logs
- reload_into_ims
- always_direct
- never_direct
- header_access
- header_replace
- icon_directory
- error_directory
- maximum_single_addr_tries
- snmp_port
- snmp_access
- snmp_incoming_address
- snmp_outgoing_address
- as_whois_server
- wccp_router
- wccp_version
- wccp_incoming_address
- wccp_outgoing_address
- delay_pools
- delay_class
- delay_access
- delay_parameters
- delay_initial_bucket_level
- incoming_icp_average
- incoming_http_average
- incoming_dns_average
- min_icp_poll_cnt
- min_dns_poll_cnt
- min_http_poll_cnt
- max_open_disk_fds
- offline_mode
- uri_whitespace
- broken_posts
- mcast_miss_addr
- mcast_miss_ttl
- mcast_miss_port
- mcast_miss_encode_key
- nonhierarchical_direct
- prefer_direct
- strip_query_terms
- coredump_dir
- ignore_unknown_nameservers
- digest_generation
- digest_bits_per_entry
- digest_rebuild_period
- digest_rewrite_period
- digest_swapout_chunk_size
- digest_rebuild_chunk_percentage
- chroot
- client_persistent_connections
- server_persistent_connections
- pipeline_prefetch
- extension_methods
- request_entities
- high_response_time_warning
- high_page_fault_warning
- high_memory_warning
- ie_refresh
- vary_ignore_expire
- sleep_after_fork
- B. The Memory Cache
- C. Delay Pools
- D. Filesystem Performance Benchmarks
- E. Squid on Windows
- F. Configuring Squid Clients
- About the Author
- Colophon
- Copyright
Name
memory_pools
Synopsis
Squid’s memory pools are an attempt to optimize the way Squid allocates and
frees memory. Certain data structures inside Squid are
pooled. This means that rather than freeing
unused memory, Squid holds onto it for future use. It also means that
a particular chunk of memory is normally used for the same type of
data structure. Memory pools may improve Squid’s performance by
avoiding frequent calls to malloc(
) and free( ). The downside, however, is that
the overall memory usage may be higher. If memory is a precious
resource on your system, you might want to disable memory
pools.