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POincrease efficiency of concurrent dictionary access c#
 

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  1. POincrease efficiency of concurrent dictionary access c#
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    <p>I have a list that is accessed by multiple background threads to update/read. Updates actions include both insertions and deletions.</p> <p>To do this concurrently without synchronization problems, I am using a lock on a private readonly object in the class.</p> <p>To minimize the time I need to lock the list when reading its data, I do a deep clone of it and return the deep clone and unlock the dictionary for insert/delete updates.</p> <p>Due to this every read of the list increases the memory consumption of my service.</p> <p>One point to note is that the inserts/deletes are internal to the class that contains the list. But the read is meant for public consumption.</p> <p>My question is:</p> <p>Is there any way, I can avoid cloning the list and still use it concurrently for reads using read/write locks?</p> <pre><code>public class ServiceCache { private static List&lt;Users&gt; activeUsers; private static readonly object lockObject = new object(); private static ServiceCache instance = new ServiceCache(); public static ServiceCache Instance { get { return instance; } } private void AddUser(User newUser) { lock (lockObject) { //... add user logic } } private void RemoveUser(User currentUser) { lock (lockObject) { //... remove user logic } } public List&lt;Users&gt; ActiveUsers { get { lock (lockObject) { //The cache returns deep copies of the users it holds, not links to the actual data. return activeUsers.Select(au =&gt; au.DeepCopy()).ToList(); } } } } </code></pre>
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    1. COIf independent threads are deleting from their deep copy of the list, how to you ensure their work is meaningfully synchronized?
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      1. USEric J.
    2. COEric, the deep copy is only meant to be used as a snapshot of the cache in time and changing it should not be reflected in the actual cache.
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    3. COSide note: "To minimize the time ... I do a deep clone of it ": this is exact reason why phrase "premature optimization root of all evil" exists. Deep clone of any non-trivial object is unlikely to be a fast operation. You always should measure to understand what your "optimization" actually is.
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      1. USAlexei Levenkov
 

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